docs(scala): update scala post

docs/_posts/2022-04-24-use-vim-as-a-scala-ide.md

@@ -12,6 +12,33 @@ commentsID: "Use Vim as a Scala IDE"
 This is a general guide for using SpaceVim as a Scala IDE, including layer configuration and usage.
 Each of the following sections will be covered:
 
+<!-- vim-markdown-toc GFM -->
+
+- [Setup Scala development environment](#setup-scala-development-environment)
+- [Enable language layer](#enable-language-layer)
+- [code completion](#code-completion)
+- [alternate file jumping](#alternate-file-jumping)
+- [code running](#code-running)
+- [REPL support](#repl-support)
+- [code format](#code-format)
+
+<!-- vim-markdown-toc -->
+
+### Setup Scala development environment
+
+Make sure you have scala installed in your os.
+If you are using windows, you can install scala and coursier via:
+
+```
+scoop install scala coursier
+```
+
+If you want to use `lsp` layer, you need to install the language server for scala:
+
+```
+coursier install metals
+```
+
 ### Enable language layer
 
 `lang#scala` layer provides scala language specific features for SpaceVim.
@@ -31,7 +58,6 @@ for more info, you can read the [lang#scala](../layers/lang/scala/) layer docume
 By default the autocomplete layer has been enabled, so after loading `lang#scala` layer, the code completion
 for scala language should work well.
 
-
 ### alternate file jumping
 
 To manage the alternate file for a project, you may need to create a `.project_alt.json` file in the root of your
@@ -48,13 +74,11 @@ for example, add following content into the `.project_alt.json` file:
 
 with this configuration, you can jump between the source code and test file via command `:A`
 
-
 ### code running
 
 The key binding for running current file is `SPC l r `, it will run `sbt run` asynchronously.
 And the stdout will be shown on a runner buffer.
 
-
 ### REPL support
 
 Start a `scala` inferior REPL process with `SPC l s i`. After REPL process started,
@@ -66,12 +90,18 @@ you can send code to `scala` process via key bindings:
 | `SPC l s l`  | send line and keep code buffer focused           |
 | `SPC l s s`  | send selection text and keep code buffer focused |
 
-
 ### code format
 
+
 The code formation feature is provided by `format` layer, and this layer is enabled by default.
 The default format engine is `neoformat`, it will run `scalafmt` or `scalariform`
 asynchronously on current file.
 
-To use scalariform, you need to install [`scalariform`](https://github.com/scala-ide/scalariform).
+To use `scalafmt`, you need to install it via:
+
+```
+coursier install scalafmt
+```
+
+If you want to use scalariform, you need to install [`scalariform`](https://github.com/scala-ide/scalariform).
 and set `scalariform_jar` option to the path of the scalariform jar.