added repo link to index.html

index.html

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 <center><h1 id="espirit-python">espirit-python</h1></center>
 <h2 id="description">Description</h2>
-<p>ESPIRiT implemented in Python.</p>
+<p>ESPIRiT implemented in Python. GitHub repository located here: <a href="https://github.com/mikgroup/espirit-python">https://github.com/mikgroup/espirit-python</a>.</p>
 <h2 id="prerequisites">Prerequisites</h2>
 <p>ESPIRiT itself requires <code>numpy</code>. <code>matplotlib</code> is needed to display images.</p>
 <h2 id="usage">Usage</h2>