import memory sub-crate

crates/memory/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "memory"
+version = "0.1.0"
+authors = ["Pat Hickey <phickey@fastly.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+thiserror = "1"