update readme. add vsce dev dep

.gitignore

@@ -2,4 +2,4 @@ out
 dist
 node_modules
 .vscode-test/
-.vsix
+*.vsix

README.md

@@ -8,3 +8,29 @@ Run `npm install` first.
 
 - completion: https://github.com/microsoft/vscode-extension-samples/blob/master/completions-sample/src/extension.ts
 - syntax: https://flight-manual.atom.io/hacking-atom/sections/creating-a-legacy-textmate-grammar/
+
+## Known Issues
+
+...
+
+## Development and Release
+
+To create a new release,
+
+```sh
+# bump version number in package.json
+npm run vpackage # package the release, creates ,vsix
+npm run vpublish # publish to store, see https://code.visualstudio.com/api/working-with-extensions/publishing-extension
+# Will prompt for Azure Devops Personal Access Token, get fresh one at:
+# https://dev.azure.com/andrewkortina/
+# On "Error: Failed Request: Unauthorized(401)"
+# see: https://github.com/Microsoft/vscode-vsce/issues/11
+# The reason for returning 401 was that I didn't set the Accounts setting to all accessible accounts.
+```
+
+To install the `vsix` locally:
+
+1. Select Extensions `(Ctrl + Shift + X)`
+2. Open `More Action` menu (ellipsis on the top) and click `Install from VSIX…`
+3. Locate VSIX file and select.
+4. Reload VSCode.