Created OAuth2 (markdown)

OAuth2.md

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+## Rocket.Chat can provide OAuth2 login to Wekan
+
+## 1) Install Wekan and Rocket.Chat
+
+[Wekan](https://github.com/wekan/wekan-snap/wiki/Install)
+```
+sudo snap install wekan
+sudo snap set wekan root-url="https://wekan.example.com"
+sudo snap set wekan port='3001'
+sudo snap set core refresh.schedule=02:00-04:00
+sudo snap set wekan mail-url='smtps://user:pass@mailserver.example.com:453'
+sudo snap set wekan mail-from='Wekan Boards <support@example.com>'
+```
+Edit Caddyfile:
+```
+sudo nano /var/snap/wekan/common/Caddyfile
+```
+Add domain config:
+```
+wekan.example.com {
+        proxy / localhost:3001 {
+          websocket
+          transparent
+        }
+}
+
+chat.example.com {
+        proxy / localhost:3000 {
+          websocket
+          transparent
+        }
+}
+```