added wsgi file

powermeter.wsgi

@@ -0,0 +1,20 @@
+import sys
+import os
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'lib/python3.9/site-packages'))
+sys.path.insert(1, os.path.dirname(__file__))
+activate_this = os.path.join(os.path.dirname(__file__), 'bin/activate_this.py')
+with open(activate_this) as file_:
+    exec(file_.read(), dict(__file__=activate_this))
+from app import create_app
+
+def application(environ, start_response):
+    ENVIRONMENT_VARIABLES = [
+        'APP_CONFIG',
+        'APP_PRODUCTION_DATABASE_URI',
+        'APP_TESTING_DATABASE_URI',
+        'APP_DEVELOPMENT_DATABASE_URI'
+    ]
+    for key in ENVIRONMENT_VARIABLES:
+        os.environ[key] = environ.get(key, '')
+    app = create_app(os.getenv('APP_CONFIG', 'production'))
+    return app(environ, start_response)