Add new try repos

Author: Chuxel

docs/remote/containers.md

@@ -64,6 +64,10 @@ Let's start out by using a sample project to try things out.
     git clone https://github.com/Microsoft/vscode-remote-try-go
     git clone https://github.com/Microsoft/vscode-remote-try-java
     git clone https://github.com/Microsoft/vscode-remote-try-dotnetcore
+    git clone https://github.com/Microsoft/vscode-remote-try-php
+    git clone https://github.com/Microsoft/vscode-remote-try-ruby
+    git clone https://github.com/Microsoft/vscode-remote-try-rust
+    git clone https://github.com/Microsoft/vscode-remote-try-cpp
     ```
 
 2. Start VS Code and click on the quick actions Status Bar item in the lower left corner of the window.