Salesforce DX is now generally available. Visual Studio code is now officially supported with Salesforce DX instead of Force.com IDE which is not very surprising as it is very challenging to work with the Force.com IDE.
VS code uses Java and a jar file under the hood to provide syntax highlighting and auto completion. So we need to install latest version of Java first.
You also need SFDX CLI installed on your machine to use the Salesforce DX features in VSCode IDE.
Install JDK from Oracle Website and set the JAVA_HOME environment variable.
Download and install vscode from https://code.visualstudio.com/download. The extension name is
"Visual Studio Code Extension Pack for Salesforce DX"
Visual Studio Code Extension can be downloaded from
If you have already installed the extension and are facing issue like the command not appearing in the command pallete, uninstall the extension and try reinstalling those.
See and follow the procedure given in this video.