Add lsp setup instructions for text editors (#365)

* Add lsp setup instructions for text editors

* Tag vscode only

Author: satyakigh

INSTALLATION.md

@@ -0,0 +1,143 @@
+# Standalone Installation Guide
+
+This guide covers installing and configuring the CloudFormation Language Server for standalone editors.
+
+> **Note**: For Visual Studio Code, the language server is bundled with the [AWS Toolkit](https://aws.amazon.com/visualstudio/) extensions.
+
+## Prerequisites
+
+1. [Node.js](https://nodejs.org/en)
+
+## Download
+
+Download the latest release for your platform from [GitHub Releases](https://github.com/aws-cloudformation/cloudformation-languageserver/releases/latest).
+
+### Available Builds
+
+| Platform | Architecture | Node Version | Asset |
+|----------|--------------|--------------|-------|
+| macOS | ARM64 (Apple Silicon) | 22 | `cloudformation-languageserver-*-darwin-arm64-node22.zip` |
+| macOS | x64 (Intel) | 22 | `cloudformation-languageserver-*-darwin-x64-node22.zip` |
+| Linux | ARM64 | 22 | `cloudformation-languageserver-*-linux-arm64-node22.zip` |
+| Linux | x64 | 22 | `cloudformation-languageserver-*-linux-x64-node22.zip` |
+| Linux (glibc 2.28) | ARM64 | 18 | `cloudformation-languageserver-*-linuxglib2.28-arm64-node18.zip` |
+| Linux (glibc 2.28) | x64 | 18 | `cloudformation-languageserver-*-linuxglib2.28-x64-node18.zip` |
+| Windows | ARM64 | 22 | `cloudformation-languageserver-*-win32-arm64-node22.zip` |
+| Windows | x64 | 22 | `cloudformation-languageserver-*-win32-x64-node22.zip` |
+
+### Example: macOS ARM64
+
+```bash
+curl -L -o cfn-lsp.zip \
+  https://github.com/aws-cloudformation/cloudformation-languageserver/releases/latest/download/cloudformation-languageserver-darwin-arm64-node22.zip
+
+unzip cfn-lsp.zip -d /path/to/install-location
+```
+
+## Server Configuration
+
+### Running the Server
+
+```bash
+node /path/to/install-location/cfn-lsp-server-standalone.js --stdio
+```
+
+Communication options:
+- `--stdio` - Use stdin/stdout (recommended)
+- `--node-ipc` - Use Node IPC
+
+### Initialization Options
+
+The language server accepts initialization options via the LSP `initialize` request:
+
+```json
+{
+  "initializationOptions": {
+    "aws": {
+      "clientInfo": {
+        "extension": {
+          "name": "your-editor-name",
+          "version": "1.0.0"
+        }
+      },
+      "telemetryEnabled": true
+    }
+  }
+}
+```
+
+| Option | Type              | Description |
+|--------|-------------------|-------------|
+| `aws.clientInfo.extension.name` | string            | Your editor/client name |
+| `aws.clientInfo.extension.version` | string            | Your editor/client version |
+| `aws.clientInfo.clientId` | string (optional) | Unique identifier for the client instance |
+| `aws.telemetryEnabled` | boolean           | Enable anonymous usage metrics (default: `false`) |
+
+See [Telemetry](src/telemetry/README.md) for details on collected metrics.
+
+### Supported File Types
+
+- `yaml` - YAML CloudFormation templates
+- `json` - JSON CloudFormation templates
+- `cfn`, `tempalte` - Custom CloudFormation template extensions
+
+---
+
+## Editor Setup
+
+### Neovim
+
+```lua
+local lspconfig = require("lspconfig")
+local configs = require("lspconfig.configs")
+
+if not configs.cfn_lsp then
+  configs.cfn_lsp = {
+    default_config = {
+      cmd = { "node", "/path/to/install-location/cfn-lsp-server-standalone.js", "--stdio" },
+      filetypes = { "yaml", "json" },
+      root_dir = function(fname)
+        return lspconfig.util.root_pattern(".git", "package.json")(fname) or vim.fn.getcwd()
+      end,
+      init_options = {
+        aws = {
+          clientInfo = {
+            extension = { name = "neovim", version = vim.version().major .. "." .. vim.version().minor },
+            clientId = vim.fn.hostname(),
+          },
+          telemetryEnabled = true,
+        },
+      },
+    },
+  }
+end
+
+lspconfig.cfn_lsp.setup({})
+```
+
+Verify: Open a YAML/JSON file and run `:LspInfo`
+
+### Sublime Text (LSP package)
+
+Add to LSP settings:
+
+```json
+{
+  "clients": {
+    "cfn-lsp": {
+      "enabled": true,
+      "command": ["node", "/path/to/install-location/cfn-lsp-server-standalone.js", "--stdio"],
+      "selector": "source.yaml | source.json",
+      "initializationOptions": {
+        "aws": {
+          "clientInfo": {
+            "extension": { "name": "sublime", "version": "4.0" },
+            "clientId": "sublime-client"
+          },
+          "telemetryEnabled": true
+        }
+      }
+    }
+  }
+}
+```

README.md

@@ -58,6 +58,12 @@ The server implements the Language Server Protocol (LSP) to enable code editors
 - **Regional Schemas** - Automatic schema retrieval and caching for different AWS regions
 - **Tree-sitter Parsing** - Fast and accurate syntax parsing
 
+## Installation
+
+For standalone editors like Neovim, Emacs, Helix, or Sublime Text, see the [Installation Guide](INSTALLATION.md).
+
+For Visual Studio Code, the language server is bundled with the [AWS Toolkit](https://aws.amazon.com/visualstudio/) extensions.
+
 ## Telemetry
 
 The CloudFormation Language Server collects anonymous usage metrics. See [Telemetry](src/telemetry/README.md) for details on what is collected and how to control telemetry settings.