Include UC UI in Quick Start (unitycatalog#442)

Add instructions to start UC UI in the Quick Start

**PR Checklist**

- [X] A description of the changes is added to the description of this
PR.
- [ ] If there is a related issue, make sure it is linked to this PR.
- [ ] If you've fixed a bug or added code that should be tested, add
tests!
- [ ] If you've added or modified a feature, documentation in `docs` is
updated

**Description of changes**
Adding instructions and screenshot of the Unity Catalog UI.

<!-- Please state what you've changed and how it might affect the users.
-->

Author: dennyglee

README.md

@@ -13,7 +13,7 @@ Unity Catalog is the industry’s only universal catalog for data and AI.
 
 The first release of Unity Catalog focuses on a core set of APIs for tables, unstructured data, and AI assets - with more to come soon on governance, access, and client interoperability. This is just the beginning!
 
-![image info](./docs/assets/images/uc.png)
+![UC Hero Image](./docs/assets/images/uc.png)
 
 ### Vibrant ecosystem
 
@@ -145,6 +145,21 @@ SELECT * from unity.default.numbers;
 You should see the tables listed and the contents of the `numbers` table printed.
 To quit DuckDB, press `Ctrl`+`D` (if your platform supports it), press `Ctrl`+`C`, or use the `.exit` command in the DuckDB shell.
 
+### Interact with the Unity Catalog UI
+
+![UC UI](./docs/assets/images/uc-ui.png)
+
+To use the Unity Catalog UI, start a new terminal and ensure you have already started the UC server (e.g., `./bin/start-uc-server`)
+
+```
+cd /ui
+yarn install
+yarn start
+open localhost:3000
+```
+
+
+
 ## CLI tutorial
 
 You can interact with a Unity Catalog server to create and manage catalogs, schemas and tables,