message: Edit resources/snippetpanel/README.md
diff: ### Overview
  -`snippetpanel.json` is generated by `dev/createSymbolSvgs.ts`. `snippetpanel.json` includes all the SVG texts to display the snippet panel. The tab of `TikZ` is directly written on the HTML file.
  +`snippetpanel.json` is generated by `dev/createSymbolSvgs.ts`. `snippetpanel.json` includes all the SVG texts to display the snippet panel. They are loaded by the extension host and are send to the Webview panel.
  +
  +The content of the tab of `TikZ`, including SVG files, is directly written on the HTML file.
  