Add skeleton for cog documentation

README.md

@@ -130,6 +130,10 @@ The aim of this project is to have a quick guide of what to do when an emergency
 * [Ban a single IP using Redis and Rack Attack](howto/ban-an-IP-with-redis.md)
 * [Ban a netblock on HAProxy](howto/ban-netblocks-on-haproxy.md)
+### Manage Marvin, our infra bot
+
+* [Manage cog](howto/manage-cog.md)
+
 ### Debug and monitor
 * [Tracing the source of an expensive query](howto/tracing-app-db-queries.md)

howto/manage-cog.md

+# COG
+
+[Cog](https://operable.io/) is a chatops bot that lurks in our slack, it replies to the name of [@marvin](https://en.wikipedia.org/wiki/Marvin_\(character\))
+
+## How to
+
+### Run cogctl
+
+* ssh into cog.gitlap.com
+...
+
+### Add a user
+
+...
+
+### Install a bundle
+
+...
+
+### Add a user to a group
+
+...