Added some security considerations

INSTALL.md

@@ -173,9 +173,9 @@ server {
 
     location / {
 
+      proxy_set_header        Client-IP $remote_addr;
       proxy_set_header        Host $host;
-      proxy_set_header        X-Real-IP $remote_addr;
-      proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header        X-Forwarded-For $remote_addr;
       proxy_set_header        X-Forwarded-Proto $scheme;
 
       proxy_pass          http://localhost:5082/;

README.md

@@ -77,6 +77,14 @@ $setmulti(albumartistssort,%_albumartists_sort%)
 * Previous track: <kbd>Ctrl</kbd> + <kbd>Left</kbd>
 * Next track: <kbd>Ctrl</kbd> + <kbd>Right</kbd>
 
+## Security considerations
+_Wt_ (the web framework used) has some [built-in security mesures](https://www.webtoolkit.eu/wt/features#security), but _LMS_ also has some too:
+* to mitigate brute force login attempts, _LMS_ uses an internal login throttler based on the client IP address. The `Client-IP` or `X-Forwarded-For` headers are used to determined the real IP adress, so make sure to properly configure your reverse proxy to filter or even erase the values (see example in [INSTALL.md](INSTALL.md)).
+* all passwords are stored hashed and salted using [bcrypt](https://fr.wikipedia.org/wiki/Bcrypt)
+* all the resources relative to the music collection (tracks, covers, etc.) are private to a session
+
+## Keyboard shortcuts
+
 ## Installation
 
 See [INSTALL.md](INSTALL.md) file.