Create Http_API.md

Author: Roberto De Ioris

docs/Http_API.md

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+The HTTP API
+-
+
+The IHttpRequest and IHttpResponse interfaces are exposed as Python classes (both inheriting from IHttpBase)
+
+The usage is pretty 'pythonic' and support both polling and evented approaches:
+
+```python
+from unreal_engine import IHttpRequest
+import json
+
+request = IHttpRequest('Get', 'http://httpbin.org/user-agent')
+request.process_request()
+
+response = request.get_response()
+
+data = json.loads(response.get_content_as_string())
+
+ue.log(data)
+```