added setupoptions for github

setup/action.yml

@@ -1,17 +1,18 @@
 name: setup
-description: GitHub Action for Easy Semantic Versioning with GitVersion. Installs GitVersion and compute the version from git
+description: GitHub Action for Easy Semantic Versioning with GitVersion. Installs the specific version of GitVersion.Tool
 author: GitTools
 branding:
   color: gray-dark
   icon: git-pull-request
 inputs:
-  who-to-greet:  # id of input
-    description: 'Who to greet'
+  versionSpec:
+    description: Required version in the form of 5.x or exact version like 5.0.0'
     required: true
-    default: 'World'
-outputs:
-  time: # id of output
-    description: 'The time we greeted you'
+    default: ''
+  includePrerelease:
+    description: Include pre-release versions when matching a version 
+    required: false
+    default: false
 runs:
   using: node12
   main: ../dist/github/setup/index.js