Update readme.md

Author: Sploder-Saptarshi

readme.md

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+<h1>Sploder Launcher</h1>
+A project that aims to revive <a href="https://sploder.com">sploder</a>.
+<h1>How to use:</h1>
+- Download the <a href="https://github.com/Sploder-Saptarshi/Sploder-Launcher/releases">latest release</a> from here.<br>
+- Run the installer.<br>
+- Done.<br>
+<h1>How to build:</h1>
+- Install yarn.<br>
+- Install all the required packages by running <code>yarn</code>.<br>
+- Run <code>yarn dist</code>.<br>
+- The built files will be available in the dist folder.