Add file input for data reading

_includes/header.html

@@ -8,6 +8,7 @@
     <form id="dataform" class="form">
       <h3>Add War</h3>
       <textarea id="data">{{ site.testdata }}</textarea>
+      <input id="fileUpload" type="file" accept=".har" />
       <br />
       <input type="submit" value="Submit" class="button" />
       <input type="reset" value="Reset" class="button" />

_includes/scripts.html

@@ -7,6 +7,7 @@
   <script src="{{ "/assets/js/lib/jquery-3.4.1.min.js" | relative_url }}"></script>
   <script src="{{ "/assets/js/map.js" | relative_url }}"></script>
   <script src="{{ "/assets/js/utils.js" | relative_url }}"></script>
+  <script src="{{ "/assets/js/file_reader.js" | relative_url }}"></script>
   <script src="{{ "/assets/js/app.js" | relative_url }}"></script>
   <script src="{{ "/assets/js/localstorage.js" | relative_url }}"></script>
   <script src="{{ "/assets/js/hamburger.js" | relative_url }}"></script>