add some documentation

configs/nvim/after/plugin/nvim_comment.lua

@@ -1,3 +1,23 @@
+-- ## Usage
+--
+-- Either use the command `CommentToggle`, e.g.:
+--
+-- - `CommentToggle` comment/uncomment current line
+-- - `67,69CommentToggle` comment/uncomment a range
+-- - `'<,'>CommentToggle` comment/uncomment a visual selection
+--
+-- Or use the default mappings:
+--
+-- - `gcc` comment/uncomment current line, this does not take a count, if you want
+--   a count use the `gc{count}{motion}`
+-- - `gc{motion}` comment/uncomment selection defined by a motion (as lines are
+--   commented, any comment toggling actions will default to a linewise):
+--   - `gcip` comment/uncomment a paragraph
+--   - `gc4w` comment/uncomment current line
+--   - `gc4j` comment/uncomment 4 lines below the current line
+--   - `dic` delete comment block
+--   - `gcic` uncomment commented block
+
 require('nvim_comment').setup(
     {
         -- Linters prefer comment and line to have a space in between markers