Rename project structure with /core and /client

core/document/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "graphite-document-core"
+version = "0.1.0"
+authors = ["Graphite Authors <graphite@keavon.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

core/document/src/lib.rs

@@ -0,0 +1,7 @@
+#[cfg(test)]
+mod tests {
+	#[test]
+	fn it_works() {
+		assert_eq!(2 + 2, 4);
+	}
+}