Created Workers setup with nginx (markdown)

Workers-setup-with-nginx.md

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+**WIP**
+
+The actual documentation for setting up workers is not really easy to follow :
+
+https://github.com/matrix-org/synapse/tree/master/contrib/systemd-with-workers
+https://github.com/matrix-org/synapse/blob/master/docs/workers.md
+
+This is how I (try) to setup the workers. 
+**WARNING : SHOULD BE REVIEWED ! WIP ! Actually this breaks my setup in a lot of strange places**
+
+# Background
+
+* My setup is having around 400 users. mostly around 300 concurrent connections on day time. 4500 local rooms. Some big federated rooms too.
+* Server is running in a VMware with 16 CPU and 32GB RAM (half of it for postgreSQL).
+* DB is 14GB big
+* nginx is used as a reverse proxy
+* Synapse homeserver process was hammering with 100-120%CPU all day long
+
+# Which workers are meaningful ?
+
+First, I wanted to check what endpoints are asked the most in my installation :
+
+