added manual step description

Author: jennyps

incubator/manual-step/README.md

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+# Import Docker Images Codefresh Plugin
+
+Pause execution till user connect to exposed URL and submit Form with required details
+
+## Environment Variables
+
+- `APPROVAL_URL`: url of manual approval form

incubator/manual-step/plugin.yaml

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+image: codefresh/manual-step
+tag: master
+version: 0.1.0
+description: Pause execution till user connect to exposed URL and submit Form with required details
+keywords:
+  - docker
+  - manual
+home: https://github.com/jennyps/cf-manual-step
+sources:
+  - https://github.com/jennyps/cf-manual-step
+maintainers: # (optional)
+  - name: Jenny Passi
+    email: [email protected]
+icon: https://dab1nmslvvntp.cloudfront.net/wp-content/uploads/2016/11/1479211772build-image-with-dockerfile_feature.jpg
+envs:
+  - name: APPROVAL_URL
+    type: required
+    description: url of manual approval form