doc: adding treemacs readme (doomemacs#4797)

* fix: rebase readme too combine lsp settings

* doc:finish Sections of the README (now with +lsp!)

* fix: punctuation and wording.

Sentences should now be punctuated and the sentence at the start of
configuration now is a little easier to understand IMO

* Revert "fix: punctuation and wording."

This reverts commit b0155b0.

* Revert "Revert "fix: punctuation and wording.""

This reverts commit 3933660.

modules/ui/treemacs/README.org

@@ -15,6 +15,11 @@
 
 * Description
 [[https://github.com/Alexander-Miller/treemacs][Treemacs]] is a file and project explorer similar to NeoTree or vim’s NerdTree, but largely inspired by the Project Explorer in Eclipse. It shows the file system outlines of your projects in a simple tree layout allowing quick navigation and exploration, while also possessing basic file management utilities.
+It includes:
+
++ Integration with Git  (when =:tools magit= is enabled)
++ Integration with Evil (when =:editor evil +everywhere= is enabled)
++ Workspace awareness (when =:ui workspaces= is enabled)
 
 ** Maintainers
 + This module has no dedicated maintainers.
@@ -23,21 +28,44 @@
 + =+lsp= Enable ~lsp-treemacs~ integration and add shortcuts for common commands.
 
 ** Plugins
-+ [[https://github.com/Alexander-Miller/treemacs][treemacs]]
-+ [[https://github.com/Alexander-Miller/treemacs/blob/master/src/extra/treemacs-evil.el][treemacs-evil]]
-+ [[https://github.com/Alexander-Miller/treemacs/blob/master/src/extra/treemacs-projectile.el][treemacs-projectile]]
-+ [[https://github.com/Alexander-Miller/treemacs/blob/master/src/extra/treemacs-magit.el][treemacs-magit]]
-+ [[https://github.com/Alexander-Miller/treemacs/blob/master/src/extra/treemacs-persp.el][treemacs-persp]]
-+ [[https://github.com/emacs-lsp/lsp-treemacs][lsp-treemacs]]
++ [[https://github.com/Alexander-Miller/treemacs/][treemacs]]
++ [[https://github.com/Alexander-Miller/treemacs/#treemacs-projectile][treemacs-projectile]]
++ =:editor evil +everywhere=
+  + [[https://github.com/Alexander-Miller/treemacs/#treemacs-evil][treemacs-evil]]
++ =:tools magit=
+  + [[https://github.com/Alexander-Miller/treemacs/#treemacs-magit][treemacs-magit]]
++ =:ui workspaces=
+  + [[https://github.com/Alexander-Miller/treemacs/#treemacs-persptreemacs-perspective][treemacs-persp]]
++ =+lsp=
+  + [[https://github.com/emacs-lsp/lsp-treemacs][lsp-treemacs]]
 
 * Prerequisites
-This module has no prerequisites.
+If ~+treemacs-git-mode~ is set to ~extended~ or ~deferred~ you will need to have
+~python3~ installed.
 
 * Features
-# TODO
+The project bar can be opened using =SPC o p=.
+
+| Keybind | Description                                                     |
+|---------+-----------------------------------------------------------------|
+| =o s=     | Open a horizontal dired buffer on the currently highlighted node |
+| =o v=     | Open a vertical dired buffer on the currently highlighted node  |
 
 * Configuration
-# TODO
+The variable ~+treemacs-git-mode~ sets the type of git integration that treemacs
+has.
+
+There are 3 possible values:
+
+  1. simple, which highlights only files based on their git status, and is
+     slightly faster,
+  2. extended, which highlights both files and directories, but requires
+     python,
+  3. deferred, same as extended, but highlights asynchronously.
+
+the default being simple
+
+This must be set before treemacs has loaded.
 
-* Troubleshooting
-# TODO
+* TODO Troubleshooting
+# Common issues and their solution, or places to look for help.