Added graphql-query to content (#1381)

Author: denisart

src/content/code/language-support/python/client/graphql-query.md

@@ -0,0 +1,103 @@
+---
+name: graphql-query
+description: Complete GraphQL query string generation for python.
+url: https://denisart.github.io/graphql-query/
+github: denisart/graphql-query
+---
+
+**graphql_query** is complete GraphQL query string builder for python. With **graphql_query**
+you can The documentation for **graphql_query** can be found at [https://denisart.github.io/graphql-query/](https://denisart.github.io/graphql-query/).
+
+```
+$ pip install graphql_query
+```
+
+Code for the simple query
+
+```graphql
+{
+  hero {
+    name
+  }
+}
+```
+
+it is
+
+```python
+from graphql_query import Operation, Query
+
+hero = Query(name="hero", fields=["name"])
+operation = Operation(type="query", queries=[hero])
+
+print(operation.render())
+"""
+query {
+  hero {
+    name
+  }
+}
+"""
+```
+
+For generation of the following query
+
+```graphql
+query Hero($episode: Episode, $withFriends: Boolean!) {
+  hero(episode: $episode) {
+    name
+    friends @include(if: $withFriends) {
+      name
+    }
+  }
+}
+```
+
+we have
+
+```python
+from graphql_query import Argument, Directive, Field, Operation, Query, Variable
+
+episode = Variable(name="episode", type="Episode")
+withFriends = Variable(name="withFriends", type="Boolean!")
+
+arg_episode = Argument(name="episode", value=episode)
+arg_if = Argument(name="if", value=withFriends)
+
+hero = Query(
+    name="hero",
+    arguments=[arg_episode],
+    fields=[
+        "name",
+        Field(
+            name="friends",
+            fields=["name"],
+            directives=[Directive(name="include", arguments=[arg_if])]
+        )
+    ]
+)
+operation = Operation(
+    type="query",
+    name="Hero",
+    variables=[episode, withFriends],
+    queries=[hero]
+)
+print(operation.render())
+"""
+query Hero(
+  $episode: Episode
+  $withFriends: Boolean!
+) {
+  hero(
+    episode: $episode
+  ) {
+    name
+    friends @include(
+      if: $withFriends
+    ) {
+      name
+    }
+  }
+}
+"""
+```