add client (#193)

my_flask_graphql_app/client.py

@@ -0,0 +1,33 @@
+import requests
+
+def query_all_users():
+    url = 'http://127.0.0.1:5000/graphql'
+    query = """
+    {
+      allUsers {
+        edges {
+          node {
+            id
+            username
+            email
+          }
+        }
+      }
+    }
+    """
+    response = requests.post(url, json={'query': query})
+    if response.status_code == 200:
+        return response.json()
+    else:
+        raise Exception(f"Query failed to run with a {response.status_code}.")
+
+def main():
+    try:
+        result = query_all_users()
+        print("Query result:")
+        print(result)
+    except Exception as e:
+        print(e)
+
+if __name__ == '__main__':
+    main()