add release documentation

docs/maintainers.md

@@ -0,0 +1,21 @@
+# Documentation for maintainers
+
+Since this is a VSCode Extension used by PHP/Javascript programmers it might be a good idea to document
+some things.
+
+Full documentation on https://code.visualstudio.com/api/working-with-extensions/publishing-extension
+
+## Making a release
+
+- Write changelog
+- Update version number in `package.json` & `VERSION.md`
+- Commit & Push those changes and create a new tag with the version number
+- Make a [new release with GitHub](https://github.com/WengerK/vscode-highlight-bad-chars/releases/new)
+- Create a Publish Access Token on Azure (https://dev.azure.com/wengerk)
+- Build the extension with `vsce package` 
+- Login wit the previously created access Token `vsce login TOKEN` to publish
+- Publish the extension `vsce publish`
+
+It makes take some minutes for the extension to be published on the Market.
+https://marketplace.visualstudio.com/items?itemName=wengerk.highlight-bad-chars
+