Updated grammar updater, wrote a README, added Swift grammar, updated Kotlin grammar to v0.3.1

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_automation/README.md

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+# Grammar Version Checker
+
+This Go program automates the process of checking and updating grammar versions for various programming languages. It targets specific grammars defined in a JSON configuration file and supports operations like checking for updates and performing updates.
+
+## Features
+
+- **Check for Updates**: Scan through defined grammars and check if there are new versions available.
+- **Update Grammar**: Update a specific grammar to its latest version.
+- **Update All**: Batch update all grammars to their latest versions.
+
+## Prerequisites
+
+- Go installed on your machine.
+- Git installed and accessible from your command line.
+
+## Configuration
+
+The program relies on a JSON file (`_automation/grammars.json`) for the list of grammars to manage. Each grammar should specify its `language`, `url`, `files`, `reference` (tag or branch), and `revision` (commit hash).
+
+Example structure of `grammars.json`:
+
+```json
+[
+  {
+    "language": "golang",
+    "url": "https://github.com/tree-sitter/tree-sitter-go",
+    "files": [
+      "parser.c"
+    ],
+    "reference": "master",
+    "revision": "64457ea6b73ef5422ed1687178d4545c3e91334a",
+    "updatedBasedOn": "commit", //OPTIONAL: Use "tag" (instead of "commit") to restrict updates to the latest tag and not latest commit
+  }
+]
+```
+
+`updatedBasedOn` is an OPTIONAL property. If not provided, updating from the latest commit will be presumed.
+
+## Usage 
+
+### To Check for Updates
+
+```bash
+go run ./_automation/main.go check-updates
+```
+
+### To update a specific grammar
+```bash
+go run ./_automation/main.go update <language> [--force]
+```
+
+### To update all grammars
+```bash
+go run ./_automation/main.go update-all
+```
+
+## Test After Updating
+Once you've updated a grammar, it is important to test that the binding tests still pass (`binding_test.go`). Then run:
+
+```bash
+go test -v ./...
+```