Added outline readme

outline/README.md

@@ -0,0 +1,43 @@
+# Outline
+
+**Official documentation:**
+https://docs.getoutline.com/s/hosting/doc/hosting-outline-nipGaCRBDu
+
+**Unofficial tutorial:**
+https://www.youtube.com/watch?v=IY1jONuTEic
+
+## Setup
+```bash
+docker compose up -d
+```
+
+The application is configured on the port 3000. To access it, a reverse proxy entry should be defined.
+
+## Folder mapping
+
+```
+mp0: /mnt/raiddisk/data_outline/database,mp=/mnt/database,replicate=0
+mp1: /mnt/raiddisk/data_outline/data,mp=/mnt/data,replicate=0
+```
+
+```
+lxc.idmap: u 0 100000 999
+lxc.idmap: u 999 1004 1
+lxc.idmap: u 1000 101000 1
+lxc.idmap: u 1001 1003 1
+lxc.idmap: u 1002 101002 64534
+lxc.idmap: g 0 100000 999
+lxc.idmap: g 999 1006 1
+lxc.idmap: g 1000 101000 1
+lxc.idmap: g 1001 1005 1
+lxc.idmap: g 1002 101002 64534
+```
+
+**Note**:
+- *data* folder must be owned by 1001:100000
+- *database* folder must be owned by 999:100000
+
+## Slack login configuration
+The easiest way to configure the authentication process is to use the API provided by slack. The two secrets provided muse be set in the .env file.
+
+### Procedure