Create validator.md

Create fork-choice.md

Create polynomial-commitments.md

Create beacon-chain.md

Update README.md

Update beacon-chain.md

Merge pull request #31 from djrtwo/patch-2

minor language updates for capella

Update beacon-chain.md

Added description of withdrawals

More annotated spec updates

Annotated introduction

Update README.md

Update README.md

Copied in capella beacon chain spec