[Improvement]: Show the option to select Java in the project form

[dakshesh14]

[Improvement]: Show the option to select Java in the project form

Potential Fix:

1. In app/constant/project.ts, there's a constant named PROJECT_TYPES, add an option for Java.
2. In apiserver/project/api/api.py, on the class ProjectListCreateAPIView add an elif condition for Java programming language. Provide the "Hello World" code as the content for the Main.java file.
3. Docker set is already done, so you don't have to worry about it, otherwise please feel free to open an issue.

[adityaRawat14]

hey please assign it to me ,
i have done the changes,

[dakshesh14]

@adityawillcode you can take this issue. Please, raise the PR on this branch: feat/java_support