Create README.md (#1947)

* Create README.md

* bump

* Update README.md

action.yml

@@ -4,7 +4,7 @@ author: 'GitHub'
 description: 'It is a simple combination of various linters, written in bash, to help validate your source code.'
 runs:
   using: 'docker'
-  image: 'docker://ghcr.io/github/super-linter:v4.7.2'
+  image: 'docker://ghcr.io/github/super-linter:v4.7.3'
 branding:
   icon: 'check-square'
   color: 'white'

slim/README.md

@@ -0,0 +1,33 @@
+# GitHub Super-Linter Slim Image Action
+
+The **GitHub Super-Linter** maintains `two` major images:
+
+- `github/super-linter:v4`
+- `github/super-linter:slim-v4`
+
+In order to help users pull this image more naturally, the `action.yml` in this directory can help users pull the `slim image`.
+
+## Slim Image
+
+The slim `github/super-linter:slim-v4` comes with all supported linters but removes the following:
+
+- `rust` linters
+- `dotenv` linters
+- `armttk` linters
+- `pwsh` linters
+- `c#` linters
+
+By removing these linters, we were able to bring the image size down by `2gb` and drastically speed up the build and download time.
+The behavior will be the same for non-supported languages, and will skip languages at run time.
+Example usage:
+
+```yml
+################################
+# Run Linter against code base #
+################################
+- name: Lint Code Base
+  uses: github/super-linter/slim@v4
+  env:
+    VALIDATE_ALL_CODEBASE: false
+    DEFAULT_BRANCH: master
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}