Add README

Author: pleshakov

README.md

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+# NGINX Plus Golang SDK
+
+This SDK includes a client library for working with NGINX Plus API.
+
+## About the SDK
+
+`client/nginx_client.go` includes functions and data structures for working with NGINX Plus API as well as some helper functions.
+
+## Using the SDK
+
+For now, copy `client/nginx_client.go` into your go project.
+
+## Testing
+
+Prerequisites:
+* Docker
+* golang
+* Make
+* NGINX Plus license -- put `nginx-repo.crt` and `nginx-repo.key` into the `docker` folder.
+
+Steps:
+1. Build an NGINX Plus Image:
+    ```
+    $ make docker-build
+    ```
+1. Run an NGINX Plus container:
+    ```
+    $ make run-nginx-plus
+    ```
+1. Make sure `GOPATH` is configured properly.
+1. Run both unit and e2e tests:
+    ```
+    $ make test
+    ```
+
+
+