karlen Gradle MCP for 1.8.9 with optifine
Clone the repository into whatever folder you want (Mine is in my coding folder), open the project in Intellij IDEA then make a new run configuration (Application) and copy everything from the image below.
Now you can start Minecraft!
Just run the "build" run command in the gradle tab
Once you've done that go into the build/libs directory inside of the GradleMCP-Base folder open the jar file with 7-zip or Winrar, now delete the META-INF folder and I think you know how to do everything to get it to start in the launcher.
Credits to Markelectro for the marCloud repo