Add readme and changelog to corelib and prepare changeset

.changeset/honest-apes-worry.md

@@ -0,0 +1,6 @@
+---
+"@mondokit/gcp-core": patch
+"@mondokit/core": patch
+---
+
+Split out core functionality that is not GCP-specific into a base core lib so we can re-use across other cloud providers going forward.

README.md

@@ -76,7 +76,7 @@ these steps should save some time:
 - Copy `package.json`, `tsconfig.json`, `tsconfig.prod.json`, `jest.config.json` from one of the existing packages
 - Update `package.json` to match desired name, version, dependencies, etc
 - Update `tsconfig.json` to match desired project references.
-- Create file src/index.ts and export some constant
+- Create file `src/index.ts` and export some constant
 - Run `npm install` from root folder
 - Run `npm run build` from project folder
 

packages/core/CHANGELOG.md

@@ -0,0 +1,2 @@
+# @mondokit/core
+

packages/core/README.md

@@ -0,0 +1,6 @@
+# MondoKit Core
+
+Core library components that are not bound to any cloud provider. If you are using other libraries in `@mondokit`, then it is unlikely that you will need to depend on
+this directly as it is likely referenced, and relevant utilities exported, via cloud-specific libraries such as `@mondokit/gcp-core`. 
+
+[Official documentation](https://mondokit.dev/packages/gcp-core.html)