add user directories to documentation

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

README.md

@@ -32,6 +32,8 @@ WARNING: the (currently non-extant) development branch is filled with lava,
 
 - Request remapping with regex (see [usage](docs/USAGE.md))
 
+- User server spaces (see [usage](docs/USAGE.md))
+
 - Separate system and access logging
 
 # Further Docs

docs/USAGE.md

@@ -91,3 +91,23 @@ e.g. scripts within cgi-bin to the root directory:
 
 Entries are parsed, compiled, and so matched-against in order. They are matched against
 relative paths so please bear this in mind if you have user directories enabled.
+
+# User server spaces
+
+When user server spaces are enabled, they are accessed via the following gopher URL:
+
+`gopher://server.host:70/1/~user`
+
+Where the username supplied will then look for a user folder under:
+
+`/home/$user/$user_folder`
+
+For example:
+
+User directory = `public_gopher`
+
+`gopher://server.host:70/1/~grufwub`
+
+Will fetch from the filesystem:
+
+`/home/grufwub/public_gopher`