Update README.md

README.md

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 <h1>fileinfo</h1>
 A simple C++ program that displays information about files and folders.
+<h2>Installation</h2>
+First, install libmagic-dev:<br>
+<pre>
+sudo apt install libmagic-dev
+</pre><br>
+Now, compile the source code. <b>Note the <code>-lmagic</code> at the end!</b><br>
+<pre>
+g++ <path/to/source.cpp> -lmagic -o fileinfo
+</pre><br>
+And finally, copy that executable to /usr/local/bin folder.<br>
+<pre>
+sudo cp fileinfo /usr/local/bin/
+</pre>
 <h2>Usage</h2>
 <pre>
 ./a.out [args] filename ...<br>