Added a working backend container

backend/src/app.py

@@ -1,8 +1,34 @@
 import time 
 from flask import Flask
 
+import os
+
 app = Flask(__name__)
 
+# Read environment variables
+if "DEBUG" in os.environ and os.environ["DEBUG"] == 'yes':
+    debug = True
+else:
+    debug = False
+if "HOST" in os.environ:
+    host = os.environ["HOST"]
+else:
+    host = '0.0.0.0'
+if "PORT" in os.environ:
+    port = int(os.environ["PORT"])
+else:
+    port = 5000
+
+
+
+@app.route('/')
+def home():
+    return "Hello World"
+
 @app.route('/time')
 def get_current_time():
     return {'time': time.time()}
+
+
+if __name__ == '__main__':
+    app.run(debug=debug, host=host, port=port)