Create running_behind_nginx_reverse_proxy.md

docs/e-mission-server/running_behind_nginx_reverse_proxy.md

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+# Running Behind NGINX Reverse Proxy
+
+### Ramp up the body size limit
+
+You must make sure that, NGINX can accept a very large request (i.e. 1GB).
+
+So either add this to your `server` block or `http` block:
+
+```nginx
+client_max_body_size 1G;
+```
+
+Also, you must make sure that this configuration is conform with
+
+`e-mission-server/net/api/cfc_webapp.py` file.
+
+```python
+BaseRequest.MEMFILE_MAX = 1024 * 1024 * 1024 # Allow the request size to be 1G
+```