Update action information

Dockerfile

@@ -1,12 +1,3 @@
 FROM alpine:3.10.1
 
-LABEL "com.github.actions.name"="Create Zip File"
-LABEL "com.github.actions.description"="Create a zip file containing specific files from your repository"
-LABEL "com.github.actions.icon"="folder-plus"
-LABEL "com.github.actions.color"="gray-dark"
-
-LABEL "repository"="https://github.com/montudor/action-zip"
-LABEL "homepage"="https://github.com/montudor/action-zip"
-LABEL "maintainer"="Monte Hellawell <monte@montudor.com>"
-
 RUN apk add zip

action.yml

@@ -0,0 +1,15 @@
+name: Create Zip File
+author: Monte Hellawell
+description: Create a zip file containing specific files from your repository
+inputs:
+  args:
+    description: zip or unzip, followed by the relevant options
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.args }}
+branding:
+  icon: 'folder-plus'  
+  color: 'gray-dark'