Create local_attachment.py

I had trouble figuring out the format for a local attachment, thought this may help someone else!

Author: levensailor

examples/local_attachment.py

@@ -0,0 +1,16 @@
+import os
+import sys
+from webexteamssdk import WebexTeamsAPI, ApiError
+
+cwd  = os.path.abspath(os.path.dirname('.'))
+sys.path.append(cwd)
+testfile = '/'+cwd+'/test.png' #expected format: '//Users/userid/dir/test.png'
+
+file_list = []
+file_list.append(testfile)
+
+token = 'your_bot_token'
+api = WebexTeamsAPI(access_token=token)
+headers = {'Authorization': 'Bearer '+token}
+
+api.messages.create(roomId='your_room_id', files=file_list)