Add Readme

Signed-off-by: pdulvp <pdulvp@laposte.net>

README.md

@@ -1 +1,29 @@
-# tld-savemanager
+## TLD Save Manager
+
+Allows to backup/restore saves in Survival mode of The Long Dark.
+
+![alt text](images/main.gif)
+
+### Main features
+
+- Automatic backup when a save is performed (Building entrance, Zone, main event...)
+- Restore a backup to go back in time
+
+### Features
+
+- Add a Summary on backups
+- Lock a backup
+- Delete a backup. First, backups are hidden from the list and can be moved into RecycleBin
+- Manual backup of the current save *(in case where automatic backup doesn't work)*
+
+### Compatibility
+
+- The Long Dark 1.74 (Microsoft Store / Xbox Play Anywhere version) 
+- **Steam version is unsupported but contribution for compatibility is welcome**
+
+### How to
+
+- Run this program while TLD is running
+- Every time TLD perform a save, it is backuped.
+- When something occurs, you can still restore a backup.
+