add docs about lsp

docs/docs/ide_support.md

@@ -8,12 +8,90 @@ title: IDE/Text editors support
 Provides autocomplete and filetype support.
 
 [Plugin site](https://plugins.jetbrains.com/plugin/14639-lets)
+[Plugin repo](https://github.com/lets-cli/intellij-lets)
+
+### VSCode plugin (official)
+
+Provides autocomplete and filetype support.
+
+[Plugin site](https://marketplace.visualstudio.com/items?itemName=kindritskyimax.vscode-lets)
+[Plugin repo](https://github.com/lets-cli/vscode-lets)
 
 ### Emacs plugin (community)
 
 Provides autocomplete and filetype support.
 
-[Plugin site](https://github.com/mpanarin/lets-mode)
+[Plugin repo](https://github.com/mpanarin/lets-mode)
+
+### LSP
+
+`LSP` stands for `Language Server Protocol`
+
+Starting from `0.0.55` version lets comes with builtin `lsp` server under `lets self lsp` command.
+
+Lsp support includes:
+
+[x] Goto definition
+  - Navigate to definitions of mixins files
+  - Navigate to definitions of command from `depends`
+[x] Completion
+  - Complete commands in depends
+[ ] Diagnostics
+[ ] Hover
+[ ] Formatting
+[ ] Signature help
+[ ] Code action
+
+`lsp` server works with JSON Schema (see bellow).
+
+#### VSCode
+
+VSCode plugin supports lsp out of the box, you only want to make sure you have lets >= `0.0.55`.
+
+#### Neovim
+
+Neovim support for `lets self lsp` can be added manually:
+
+1. Add new filetype:
+
+```lua
+vim.filetype.add({
+  filename = {
+    ["lets.yaml"] = "yaml.lets",
+  },
+})
+```
+
+2. In your `neovim/nvim-lspconfig` servers configuration:
+
+In order for `nvim-lspconfig` to recognize `lets lsp` we must define config for `lets_ls` (lets_ls is just a conventional name because we are not officially added to `neovim/nvim-lspconfig`)
+
+```lua
+require("lspconfig.configs").lets_ls = {
+  default_config = {
+    cmd = { 
+      "lets self lsp",
+    },
+    filetypes = { "yaml.lets" },
+    root_dir = util.root_pattern("lets.yaml"),
+    settings = {},
+  },
+}
+```
+
+3. And then enable lets_ls in then servers section:
+
+```lua
+return {
+  "neovim/nvim-lspconfig",
+  opts = {
+    servers = {
+      lets_ls = {},
+      pyright = {},  -- pyright here just as hint to where we should add lets_ls
+    },
+  },
+}
+```
 
 ### JSON Schema