Add dev doc: How to build and push feathr registry docker image

docs/how-to-guides/build-and-push-feathr-registry-docker-image.md

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+---
+layout: default
+title: How to build and push feathr registry docker image
+parent: Feathr How-to Guides
+---
+
+# How to build and push feathr registry docker image
+
+This doc shows how to build feathr registry docker image locally and publish to registry
+
+## Prerequisites
+
+Follow the [instructions](https://docs.docker.com/get-docker) to setup docker locally
+
+## Build docker image locally
+
+Open terminal and go to root of this repository, run following command
+
+```bash
+cd deploy
+docker build -t blrchen/feathr-sql-registry .
+```
+
+Note: this tutorial uses **blrchen/feathr-sql-registry** as an example. You should replace it with the image name you want to use. <user_name>/<image_name> is not a mandatory format for specifying the name of the docker image.
+
+## Test docker image locally
+
+Run **docker images** command, see newly created image should be listed in output
+
+```bash
+docker images
+```
+
+Run **docker run** command to test docker image locally
+
+```bash
+docker run --env CONNECTION_STR=<__REPLACE_ME_WITH_SQL_CONNECTION_STRING__> --env API_BASE=api/v1 -it --rm -p 3000:80 blrchen/feathr-sql-registry
+```
+
+Open web browser and navigate to <https://localhost:3000>，verify you can see feathr ui and able to login successfully.
+
+## Upload to Registry
+
+Run **docker push** command to publish docker image to DockerHub
+
+```bash
+docker push blrchen/feathr-sql-registry
+```
+
+