create the circleci plugin

plugins/circleci/README.md

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+# CircleCi Plugin
+
+This plugin provides easy to use cli commands to query circle ci job statuses
+
+To use it, add `circleci` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... circleci)
+```
+
+## Prerequisites
+You need to have the `CIRCLECI_API_TOKEN` and `CIRCLECI_ORG_SLUG` as environment
+variables before calling the `circleci_status` function <br>
+You can learn how to add a circleci api token [here](https://circleci.com/docs/managing-api-tokens/) <br>
+The org slug takes the format of `{vcs}/{org_name}`
+
+## Usage
+```shell
+> circleci_status
+```
+The above command would list down all the jobs (with their run status) on the
+repository and branch that you are currently on <br>
+You can also use the `cis` alias to run the above function