Added README.md

Author: zinigor

README.md

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+[![ESLint](https://github.com/zinigor/wp-chess/actions/workflows/eslint.yml/badge.svg)](https://github.com/zinigor/wp-chess/actions/workflows/eslint.yml)
+
+## WordPress chessboard Gutenberg block
+
+This is a very simple implementation of a block that shows a starting position based on a (FEN string)[https://en.wikipedia.org/wiki/Forsyth%E2%80%93Edwards_Notation].
+
+### TODO
+
+-[] Make analysis possible.
+-[] Expand functionality to use stored moves.
+-[] Allow for games to be played between users.