Create README.md

Author: bdcoder2

README.md

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+# grid_clusterer v1.5.0
+<p>A grid clusterer for Google maps.</p>
+<h1>To use:</h1>
+<ol>
+  <li>Click on the &quot;grid_clusterer.zip&quot; archive above.</li>
+  <li>Click on the &quot;Download&quot; button and save the archive locally.</li>
+  <li>Un-zip the grid_clusterer archive</li>
+  <li><b>IMPORTANT</b>: In order to use Google maps, you require a <a href="https://developers.google.com/maps/documentation/javascript/get-api-key">Google maps API key</a>.
+    <p>Replace the string &quot;<b>[YOUR_API_KEY]</b>&quot; with your Google maps API key in all "index.html" files found in the following directories:</p>
+    <ul>
+      <li>./dist/ex0/index.html</li>
+      <li>./dist/ex1/index.html</li>
+      <li>./dist/ex2/index.html</li>
+      <li>./dist/ex3/index.html</li>
+    </ul>
+  </li>
+  <li>Using any web browser, open the &quot;/dist/index.html&quot; file.
+</ol>