Updated README with Marketplace info

Author: ngurmen

README.md

@@ -4,11 +4,12 @@ This extension simplifies addition of NatSpec compliant @author, @title, @notice
 
 ## Installation
 
-Currently, the solidity-comments VS Code extension is installed from a VSIX file only.  The VSIX file can be downloaded from the [release page](https://github.com/Dexalot/vscode-solidity-comments/releases) on GitHub.
-
-Go to `Extensions` tab and click the `...` at the top.
-
-Select `Install from VSIX` and point the file selector dialog to the downloaded VSIX file.
+The solidity-comments VS Code extension can be installed 1. from a VSIX file or 2. from VS Code Marketplace.
+1. The VSIX file can be downloaded from the [release page](https://github.com/Dexalot/vscode-solidity-comments/releases) on GitHub.
+   - Go to `Extensions` tab and click the `...` at the top.
+   - Select `Install from VSIX` and point the file selector dialog to the downloaded VSIX file.
+3. On the VS Code Marketplace the extension can be found with its name vscode-solidity-comments.
+   - Just clisk Install.
 
 ## Using