Add package for sharing jest configuration for upcoming Features (#7198)

* Add package for shared jest configurations for Lens applications, Features and libraries.

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Add root level script for running unit tests in monorepo mindset

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

* Ignore coverage files from VCS

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

---------

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

packages/infrastructure/jest/README.md

@@ -0,0 +1,55 @@
+# @k8slens/jest
+
+This package contains jest configurations and scripts for Lens packages.
+
+## Install
+
+```
+$ npm install @k8slens/jest
+```
+
+## Features
+
+### Package configurations
+Shared configurations for minimal duplication.
+
+#### Node
+
+**./packages/<any-package>/jest.config.js**
+```javascript
+module.exports = require("@k8slens/jest").monorepoPackageConfig(__dirname).configForNode;
+```
+
+#### React
+
+**./packages/<any-package>/jest.config.js**
+```javascript
+module.exports = require("@k8slens/jest").monorepoPackageConfig(__dirname).configForReact;
+```
+
+### Root configuration
+You may want to enable testing of packages using single command from root level. This allows you to utilize `jest --watch` between all packages.
+
+
+**./jest.config.js**
+```javascript
+module.exports = require("@k8slens/jest").monorepoRootConfig(__dirname);
+```
+
+### Scripts
+
+#### lens-test
+Test package with coverage enforcement. Automatically opens coverage report in case of failure.
+
+**./packages/<any-package>/package.json**
+```json
+{
+ "scripts": {
+   "test": "lens-test"
+ }         
+}
+```
+
+
+
+