docs(README): update documentation for configurable focus tag in RSpec files

Author: asux

README.md

@@ -1,6 +1,6 @@
 # Rspec Focus
 
-Add and clear `:focus` tag in RSpec files.
+Add and clear focus tag in RSpec files (default `:focus`, configurable).
 Ported from Atom's [package](https://github.com/traviskroberts/atom-rspec-focus) by [@traviskroberts](https://github.com/traviskroberts).
 
 This extension also available at [Open VCX](https://open-vsx.org/extension/asux/rspec-focus).
@@ -9,14 +9,23 @@ This extension also available at [Open VCX](https://open-vsx.org/extension/asux/
 
 With this extension you can:
 
-- add `:focus` tag to nearest RSpec test (moving upwards from cursor)
-- clear all `:focus` tags from current buffer
+- add the configured focus tag to nearest RSpec test (moving upwards from cursor)
+- clear all instances of that tag from current buffer
 
-Keymaps
+### Configurable focus tag
 
-`ctrl-alt-cmd-t` - Add `:focus` tag to closest `it`, `describe`, `context`, `feature`, `scenario`, `shared_examples`, `shared_examples_for`, `shared_context`, `include_context`, `include_examples`, `it_behaves_like` block.
+The tag used for focus is configurable (default: `focus`, e.g. `it 'example', :focus do`). You can switch to `wip` or any other symbol:
 
-`ctrl-alt-cmd-z` - Clear all `:focus` tags from current open buffer.
+- **Settings (UI):** Open Settings, search for “RSpec Focus” or “focus tag”, and set **Focus Tag** (e.g. `wip`).
+- **settings.json:** Add `"rspec-focus.focusTag": "wip"` (or another name). The value is the symbol name without the colon.
+
+Add and Clear commands always use the current setting, so you can use `:focus` for normal runs and e.g. `:wip` for work-in-progress.
+
+### Keymaps
+
+`ctrl-alt-cmd-t` — Add the configured tag to the closest `it`, `describe`, `context`, `feature`, `scenario`, `shared_examples`, `shared_examples_for`, `shared_context`, `include_context`, `include_examples`, `it_behaves_like` block.
+
+`ctrl-alt-cmd-z` — Clear all instances of the configured tag from the current buffer.
 
 ## Release Notes