Add bff

como_bff/README.md

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+# Como BFF
+
+```mermaid
+sequenceDiagram
+  client ->> bff: request /events
+  bff ->> bff: Validates cookie como.sid
+  bff ->> bff: Cookie does not exist
+  bff ->> client: 401
+  client ->> bff: Redirect /login
+  bff ->> auth: /login
+  auth ->> client: show webpage (give options)
+  client ->> auth: Submit credentials
+  auth ->> auth: Produce JWT
+  auth ->> bff: redirect with jwt/refreshtoken
+  bff ->> bff: wrap in cookie
+  bff ->> client: Redirect with cookie
+  client ->> bff: request /events
+  bff ->> events: forward request
+  events --> bff: returns events
+  bff --> client: return events
+```