Add uv as a prerequisite (#740)

* Add uv as a prerequisite

* Undo formatting changes

---------

Co-authored-by: Greg Spencer <gspencergoog@users.noreply.github.com>

Author: josemontesp

samples/client/angular/README.md

@@ -5,6 +5,7 @@ These are sample implementations of A2UI in Angular.
 ## Prerequisites
 
 1. [nodejs](https://nodejs.org/en)
+2. [uv](https://docs.astral.sh/uv/getting-started/installation/)
 
 NOTE: [For the rizzcharts app](../../agent/adk/rizzcharts/), you will need GoogleMap API ([How to get the API key](https://developers.google.com/maps/documentation/javascript/get-api-key)) to display Google Map custome components. Please refer to [Rizzcharts README](./projects/rizzcharts/README.md)
 
@@ -45,4 +46,4 @@ All operational data received from an external agent—including its AgentCard,
 
 Similarly, any UI definition or data stream received must be treated as untrusted. Malicious agents could attempt to spoof legitimate interfaces to deceive users (phishing), inject malicious scripts via property values (XSS), or generate excessive layout complexity to degrade client performance (DoS). If your application supports optional embedded content (such as iframes or web views), additional care must be taken to prevent exposure to malicious external sites.
 
-Developer Responsibility: Failure to properly validate data and strictly sandbox rendered content can introduce severe vulnerabilities. Developers are responsible for implementing appropriate security measures—such as input sanitization, Content Security Policies (CSP), strict isolation for optional embedded content, and secure credential handling—to protect their systems and users.
+Developer Responsibility: Failure to properly validate data and strictly sandbox rendered content can introduce severe vulnerabilities. Developers are responsible for implementing appropriate security measures—such as input sanitization, Content Security Policies (CSP), strict isolation for optional embedded content, and secure credential handling—to protect their systems and users.