Added Tools/githubstats.py script to check download stats from github

src/Tools/githubstats.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+
+print "Fetching download statistics from github..."
+
+import requests
+r=requests.get('https://api.github.com/repos/FreeCAD/FreeCAD/releases')
+myobj = r.json()
+for p in myobj:
+    if "assets" in p:
+        for asset in p['assets']:
+            print (asset['name'] + ": " + str(asset['download_count']) + " downloads")