update_snippet.md

1. Increment the version number in package.json file and check if all snippets are mentioned in contributes.
2. Update the README.md with the new snippet names.
3. Update the CHANGELOG.md with the changes.
4. You must have npm installed on the system. Run npm in terminal to check.
5. Open terminal and type the following commands

• npm install -g vsce
• Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
• vsce package

6. The command will create a .vsix file.
7. Open this link and click on the three dots on the Extension you want to update and press Update.
8. Drop the .vsix file and your extension will be updated.