Lack plugin Language server in Tomcat for Java tutorial

[EricZhangzf]

Environment:

• VSCode Version: 1.45.1
• OS Version: Win
• Tomcat Extension Version: 0.11.2

Result:

The Prerequisites module of Tomcat for Java tutorial;
Tomcat for java depend on Debugger, and Debugger depend on Language Server.
We need to add Language Server on this tutorial.

Link: https://marketplace.visualstudio.com/items?itemName=adashen.vscode-tomcat