[bitboard] Make an empty chess_bitboard crate

This crate lives in bitboard/

Cargo.toml

@@ -2,6 +2,7 @@
 
 members = [
     "board",
+    "chess_bitboard",
     "chess_core",
     "explorer",
 ]

bitboard/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "chess_bitboard"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+core = { path = "../core" }

bitboard/src/lib.rs

@@ -0,0 +1 @@
+// Eryn Wells <eryn@erynwells.me>