Add js/, index.js with working typing detection.

Add:
    static/js/
        -Add directory for all `javascript` files.

    static/js/index.js
        -Add functional search-bar typing-begin and typing-end detection.
        -Currently logs an appropriate message to the console in either state.

static/js/index.js

@@ -0,0 +1,16 @@
+var typingTimer;
+var finishedTypingInterval = 650;
+
+searchBar = document.querySelectorAll("form#search-bar input[type='text']")[0]
+console.log(searchBar)
+
+searchBar.onkeyup = function(){
+    clearTimeout(typingTimer);
+    if(searchBar.value){
+        typingTimer = setTimeout(finishedTyping, doneTypingInterval);
+    }
+};
+
+function finishedTyping(){
+    console.log("You stopped typing.");
+}