added sitterbot_starter and revamped sitter_bot.py quite a bit.

sitterbot_starter.py

@@ -0,0 +1,22 @@
+import os
+
+from flask import Flask, request
+from twilio.rest import Client as TwilioClient
+from twilio.twiml.messaging_response import MessagingResponse
+
+twilio_client = TwilioClient(os.getenv('TWILIO_SID'), os.getenv('TWILIO_TOKEN'))
+
+app = Flask(__name__)
+app.config.from_object(__name__)
+
+@app.route('/bot', methods=['POST'])
+def bot():
+    from_ = request.values.get('From')
+    body = request.values.get('Body').lower()
+    resp = MessagingResponse()
+    resp.message(f'ok, you said {body}.')
+    return str(resp)
+
+if __name__ == '__main__':
+    app.run(debug=True, port=8000)
+