diff --git a/doc/MLD.svg b/doc/MLD.svg
new file mode 100644
index 0000000..aae4df8
--- /dev/null
+++ b/doc/MLD.svg
@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg width="376" height="279" viewBox="0 0 376 279" xmlns="http://www.w3.org/2000/svg">
+<rect id="frame" x="0" y="0" width="376" height="279" fill="#fff" stroke="none" stroke-width="0"/>
+
+<!-- Entity PLAYER -->
+<g class="page_0_6Lmn8J6X diagram_page" visibility="visible">
+	<g>
+		<rect x="41" y="17" width="114" height="25" fill="#f4a582" stroke="#f4a582" stroke-width="0" opacity="1"/>
+		<rect x="41" y="42" width="114" height="77" fill="#fddbc7" stroke="#fddbc7" stroke-width="0" opacity="1"/>
+		<rect x="41" y="17" width="114" height="102" fill="none" stroke="#d6604d" stroke-width="2" opacity="1"/>
+		<line x1="41" y1="42" x2="155" y2="42" stroke="#d6604d" stroke-width="1"/>
+	</g>
+	<text x="75" y="34.75" fill="#000" font-family="Verdana" font-size="12">PLAYER</text>
+	<text x="46" y="59.8" fill="#000" font-family="Verdana" font-size="12">playerId</text>
+	<line x1="46" y1="62" x2="97" y2="62" stroke="#000" stroke-width="1"/>
+	<text x="46" y="76.8" fill="#000" font-family="Verdana" font-size="12">name</text>
+	<text x="46" y="93.8" fill="#000" font-family="Verdana" font-size="12">nbBallTouchTotal</text>
+	<text x="46" y="110.8" fill="#000" font-family="Verdana" font-size="12">timePlayed</text>
+</g>
+
+<!-- Entity GAME -->
+<g class="page_0_6Lmn8J6X diagram_page" visibility="visible">
+	<g>
+		<rect x="219" y="9" width="116" height="25" fill="#f4a582" stroke="#f4a582" stroke-width="0" opacity="1"/>
+		<rect x="219" y="34" width="116" height="93" fill="#fddbc7" stroke="#fddbc7" stroke-width="0" opacity="1"/>
+		<rect x="219" y="9" width="116" height="118" fill="none" stroke="#d6604d" stroke-width="2" opacity="1"/>
+		<line x1="219" y1="34" x2="335" y2="34" stroke="#d6604d" stroke-width="1"/>
+	</g>
+	<text x="259" y="26.75" fill="#000" font-family="Verdana" font-size="12">GAME</text>
+	<text x="224" y="51.8" fill="#000" font-family="Verdana" font-size="12">gameId</text>
+	<line x1="224" y1="54" x2="271" y2="54" stroke="#000" stroke-width="1"/>
+	<text x="224" y="68.8" fill="#000" font-family="Verdana" font-size="12">#playerWinner</text>
+	<text x="224" y="85.8" fill="#000" font-family="Verdana" font-size="12">#playerLoser</text>
+	<text x="224" y="102.8" fill="#000" font-family="Verdana" font-size="12">durationGame</text>
+	<text x="224" y="119.8" fill="#000" font-family="Verdana" font-size="12">nbMaxExchanges</text>
+</g>
+
+<!-- Entity CHAT -->
+<g class="page_0_6Lmn8J6X diagram_page" visibility="visible">
+	<g>
+		<rect x="62" y="169" width="72" height="25" fill="#f4a582" stroke="#f4a582" stroke-width="0" opacity="1"/>
+		<rect x="62" y="194" width="72" height="59" fill="#fddbc7" stroke="#fddbc7" stroke-width="0" opacity="1"/>
+		<rect x="62" y="169" width="72" height="84" fill="none" stroke="#d6604d" stroke-width="2" opacity="1"/>
+		<line x1="62" y1="194" x2="134" y2="194" stroke="#d6604d" stroke-width="1"/>
+	</g>
+	<text x="81" y="186.75" fill="#000" font-family="Verdana" font-size="12">CHAT</text>
+	<text x="67" y="211.8" fill="#000" font-family="Verdana" font-size="12">chatId</text>
+	<line x1="67" y1="214" x2="106" y2="214" stroke="#000" stroke-width="1"/>
+	<text x="67" y="228.8" fill="#000" font-family="Verdana" font-size="12">#playerId</text>
+	<text x="67" y="245.8" fill="#000" font-family="Verdana" font-size="12">#playerId</text>
+</g>
+
+<!-- Entity MESSAGE -->
+<g class="page_0_6Lmn8J6X diagram_page" visibility="visible">
+	<g>
+		<rect x="238" y="152" width="78" height="25" fill="#f4a582" stroke="#f4a582" stroke-width="0" opacity="1"/>
+		<rect x="238" y="177" width="78" height="93" fill="#fddbc7" stroke="#fddbc7" stroke-width="0" opacity="1"/>
+		<rect x="238" y="152" width="78" height="118" fill="none" stroke="#d6604d" stroke-width="2" opacity="1"/>
+		<line x1="238" y1="177" x2="316" y2="177" stroke="#d6604d" stroke-width="1"/>
+	</g>
+	<text x="247" y="169.75" fill="#000" font-family="Verdana" font-size="12">MESSAGE</text>
+	<text x="243" y="194.8" fill="#000" font-family="Verdana" font-size="12">messageId</text>
+	<line x1="243" y1="197" x2="310" y2="197" stroke="#000" stroke-width="1"/>
+	<text x="243" y="211.8" fill="#000" font-family="Verdana" font-size="12">message</text>
+	<text x="243" y="228.8" fill="#000" font-family="Verdana" font-size="12">timestamp</text>
+	<text x="243" y="245.8" fill="#000" font-family="Verdana" font-size="12">#playerId</text>
+	<text x="243" y="262.8" fill="#000" font-family="Verdana" font-size="12">#idChat</text>
+</g>
+
+<!-- Link from &quot;playerId&quot; (GAME) to &quot;playerId&quot; (PLAYER) -->
+<path d="M219 64.5 C187 60 197.67 55.5 155 55.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="155 55.5 167 49.5 163 55.5 167 61.5" fill="#878787" stroke-width="0"/>
+<circle cx="219" cy="64.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+
+<!-- Link from &quot;playerId&quot; (GAME) to &quot;playerId&quot; (PLAYER) -->
+<path d="M219 81.5 C187 68.5 197.67 55.5 155 55.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="155 55.5 167 49.5 163 55.5 167 61.5" fill="#878787" stroke-width="0"/>
+<circle cx="219" cy="81.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+
+<!-- Link from &quot;playerId&quot; (CHAT) to &quot;playerId&quot; (PLAYER) -->
+<path d="M62 224.5 C8 140 -13 55.5 41 55.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="41 55.5 29 61.5 33 55.5 29 49.5" fill="#878787" stroke-width="0"/>
+<circle cx="62" cy="224.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+
+<!-- Link from &quot;playerId&quot; (CHAT) to &quot;playerId&quot; (PLAYER) -->
+<path d="M134 241.5 C188 148.5 209 55.5 155 55.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="155 55.5 167 49.5 163 55.5 167 61.5" fill="#878787" stroke-width="0"/>
+<circle cx="134" cy="241.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+
+<!-- Link from &quot;playerId&quot; (MESSAGE) to &quot;playerId&quot; (PLAYER) -->
+<path d="M238 241.5 C196.5 148.5 210.33 55.5 155 55.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="155 55.5 167 49.5 163 55.5 167 61.5" fill="#878787" stroke-width="0"/>
+<circle cx="238" cy="241.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+
+<!-- Link from &quot;chatId&quot; (MESSAGE) to &quot;chatId&quot; (CHAT) -->
+<path d="M238 258.5 C186 233 203.33 207.5 134 207.5" fill="none" stroke="#878787" stroke-width="2"/>
+<polygon points="134 207.5 146 201.5 142 207.5 146 213.5" fill="#878787" stroke-width="0"/>
+<circle cx="238" cy="258.5" r="2" stroke="#878787" stroke-width="2" fill="#878787"/>
+</svg>
\ No newline at end of file