Add ./sourcekit-lsp-dev-utils script

Author: kateinoigakukun

CONTRIBUTING.md

@@ -115,6 +115,14 @@ swift package format-source-code
 
 If you are developing SourceKit-LSP in VS Code, you can also run the *Run swift-format* task from *Tasks: Run tasks* in the command palette.
 
+## Generate configuration schema
+
+If you modify the configuration options in [`SKOptions`](./Sources/SKOptions), you need to regenerate the configuration the JSON schema and the documentation by running the following command:
+
+```bash
+./sourcekit-lsp-dev-utils generate-config-schema
+```
+
 ## Authoring commits
 
 Prefer to squash the commits of your PR (*pull request*) and avoid adding commits like “Address review comments”. This creates a clearer git history, which doesn’t need to record the history of how the PR evolved.

SourceKitLSPDevUtils/README.md

@@ -1,3 +1,3 @@
 # sourcekit-lsp-dev-utils
 
-This directory contains utilities for developing SourceKit-LSP.
+This directory contains utilities for developing SourceKit-LSP. [CONTRIBUTING.md](../CONTRIBUTING.md) covers how to use these utilities.

sourcekit-lsp-dev-utils

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+swift run --package-path "$(dirname $0)/SourceKitLSPDevUtils" sourcekit-lsp-dev-utils "$@"