feat: add uffizzi usage docs

Signed-off-by: Vibhav Bobade <vibhav.bobde@gmail.com>

Author: waveywaves

docs/build-customize-contribute/using-uffizzi.md

@@ -0,0 +1,53 @@
+---
+title: Using Uffizzi
+---
+
+
+## Variables
+
+Variable           | Description
+-------------------|-------------
+BASEIMAGETAG       | The tag for base image, default:dev
+VERSIONTAG         | The tag for harbor image, default:dev
+DEVFLAG            | Build model flag, default: true
+GOBUILDIMAGE       | Golang image to compile harbor go source code.
+TRIVYFLAG          | Whether to enable trivy in harbor, default:false
+CHARTFLAG          | Whether to enable chartmuseum in harbor, default:false
+HTTPPROXY          | Clarity proxy to build UI.
+
+## Targets
+
+Target              | Description
+--------------------|-------------
+all                 | prepare env, compile binaries, build images and install images
+prepare             | prepare env
+compile             | compile core and jobservice code
+compile_core        | compile core binary
+compile_jobservice  | compile jobservice binary
+build               | build Harbor docker images
+build_base_docker   | build Harbor docker base images
+install             | compile binaries, build images, prepare specific version of compose file and startup Harbor instance
+start               | startup Harbor instance
+down                | shutdown Harbor instance
+package_online      | prepare online install package
+package_offline     | prepare offline install package
+pushimage           | push Harbor images to specific registry server
+cleanall            | remove binary, Harbor images, specific version docker-compose file, specific version tag and online/offline install package
+cleanbinary         | remove core and jobservice binary
+cleanimage          | remove Harbor images
+cleandockercomposefile  | remove specific version docker-compose
+cleanpackage        | remove online/offline install package
+
+## Examples
+
+### Build and run harbor from source code
+
+```sh
+make install
+```
+
+### Package offline installer
+
+```sh
+make package_offline
+```