feat: add vimdoc and lint workflow

Author: wesleimp

.github/workflows/lint.yaml

@@ -0,0 +1,30 @@
+name: Linting and style checking
+
+on: [push, pull_request]
+
+jobs:
+  luacheck:
+    name: Luacheck
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Prepare
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y luarocks
+          sudo luarocks install luacheck
+
+      - name: Lint
+        run: luacheck lua/stylua
+
+  stylua:
+    name: stylua
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: JohnnyMorganz/stylua-action@1.0.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --color always --check lua/

.luacheckrc

@@ -0,0 +1,15 @@
+cache = true
+
+std = luajit
+codes = true
+
+self = false
+
+ignore = {
+  "631",  -- max_line_length
+}
+
+-- Global objects defined by the C code
+globals = {
+  "vim",
+}

doc/stylua.txt

@@ -0,0 +1,21 @@
+===============================================================================
+                                                                   *stylua.nvim*
+`stylua.nvim` is a simple plugin that format you Lua code using StyLua
+
+Getting started with stylua.nvim
+
+    1. Make sure you have all requirements installed (`StyLua`, `plenary.nvim`).
+    2. Run |stylua.format| in any lua file.
+    3. Profit
+
+To find out more:
+https://github.com/wesleimp/stylua.nvim
+
+
+stylua.format({bufnr})                                           *stylua.format*
+    Format your Lua code. If {bufnr} is not set, the current buffer will be
+    used to format >
+
+    :lua require("stylua").format()
+<
+vim:tw=78:ts=8:ft=help:norl: