list the bugs, features status and limitations

[Ughuuu]

Fix the critical bugs Add missing critical feature Add the bugs and limitations to the readme

[Ughuuu]

• area2d: 21/21
• characterbody: 20/20
• collisionshape: 0/2 (one way dir not impl I think)
• directspace: 48/48
• raycast: 5/5
• rigidbodies: 33/44 features:
• moving_platform:

[Ughuuu]

Will instead make a separate issues for each problem