Create README.md

README.md

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+[![Test Rebol installer](https://github.com/Oldes/install-rebol/actions/workflows/test.yml/badge.svg)](https://github.com/Oldes/install-rebol/actions/workflows/test.yml)
+
+# Rebol Install Action
+
+This Action can install
+    [Rebol](https://github.com/Siskin-framework/Rebol)
+to a virtual machine of GitHub Actions. 
+
+
+## Usage
+
+Include this in your workflow:
+
+```yml
+ - uses: oldes/install-rebol@v1-alpha
+```
+
+These inputs are allowed:
+
+ - `version` -- an available Rebol release version (for example: `3.5.3`)
+   _Default:_ empty; installs Rebol version `3.5.3`.
+ - `product` -- one of available product build types (`base`, `core` or `bulk`)
+   _Default:_ empty; installs the `core` version.
+
+### Working Example
+
+```yml
+name: Rebol Demo
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: oldes/install-rebol@v1-alpha
+    - name: Test Rebol
+      run: ./rebol3 -v
+      shell: bash
+```