New: create initial README.md

README.md

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+## Replay structure
+
+`*.wotbreplay` is a ZIP-archive containing:
+- `battle_results.dat`
+- `meta.json`
+- `data.wotreplay`
+
+### `battle_results.dat`
+
+This is a [pickled](https://docs.python.org/3/library/pickle.html) 2-tuple:
+- Some big number
+- Battle results serialized with [Protocol Buffers](https://developers.google.com/protocol-buffers)
+
+### `meta.json`
+
+### `data.wotreplay`