Add support for nimlsp (#2815)

* Add support for nimlsp.vim
* Add test and docs for nimlsp
* Add nimlsp to supported-tools.md
* Add nimlsp to doc/ale-supported-languages-and-tools.txt

doc/ale-nim.txt

@@ -0,0 +1,25 @@
+===============================================================================
+ALE Nim Integration                                           *ale-nim-options*
+
+
+===============================================================================
+nimcheck                                                     *ale-nim-nimcheck*
+
+  ALE does not provide additional configuration options for `nimcheck` at this
+  point.
+
+
+===============================================================================
+nimlsp                                                         *ale-nim-nimlsp*
+
+g:nim_nimlsp_nim_sources                             *g:nim_nimlsp_nim_sources*
+
+  Type: |String|
+  Default: `''`
+
+  Sets the path to Nim source repository as the first argument to `nimlsp`
+  command.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale-supported-languages-and-tools.txt

@@ -282,6 +282,7 @@ Notes:
   * `nasm`!!
 * Nim
   * `nim check`!!
+  * `nimlsp`
 * nix
   * `nix-instantiate`
   * `nixpkgs-fmt`

doc/ale.txt

@@ -2307,6 +2307,9 @@ documented in additional help files.
     mmc...................................|ale-mercury-mmc|
   nasm....................................|ale-nasm-options|
     nasm..................................|ale-nasm-nasm|
+  nim.....................................|ale-nim-options|
+    nimcheck..............................|ale-nim-nimcheck|
+    nimlsp................................|ale-nim-nimlsp|
   nix.....................................|ale-nix-options|
     nixpkgs-fmt...........................|ale-nix-nixpkgs-fmt|
   nroff...................................|ale-nroff-options|