Create a basic gix-error crate to forward exn

Author: Byron

Cargo.lock

@@ -229,6 +229,7 @@ members = [
     "gix-trace",
     "gix-commitgraph",
     "gix-chunk",
+    "gix-error",
     "gix-quote",
     "gix-object",
     "gix-glob",

Cargo.toml

@@ -141,6 +141,7 @@ is usable to some extent.
   * [gix-dir](https://github.com/GitoxideLabs/gitoxide/blob/main/crate-status.md#gix-dir)
   * [gix-merge](https://github.com/GitoxideLabs/gitoxide/blob/main/crate-status.md#gix-merge)
   * [gix-shallow](https://github.com/GitoxideLabs/gitoxide/blob/main/crate-status.md#gix-shallow)
+  * [gix-error](https://github.com/GitoxideLabs/gitoxide/blob/main/crate-status.md#gix-error)
   * `gitoxide-core`
 * **very early**  _(possibly without any documentation and many rough edges)_
   * [gix-blame](https://github.com/GitoxideLabs/gitoxide/blob/main/crate-status.md#gix-blame)

README.md

@@ -572,8 +572,12 @@ A mechanism to associate metadata with any object, and keep revisions of it usin
      - note that it's less critical to support it as `gitoxide` allows access but prevents untrusted configuration to become effective.
 
 ### gix-date
-* [ ] parse git dates
-* [ ] serialize `Time`
+* [x] parse git dates
+* [x] serialize `Time`
+
+### gix-error
+
+A basic crate for comon error types and utilities, changed as needed to replace `thiserror`.
 
 ### gix-credentials
 * [x] launch git credentials helpers with a given action