Update README.md

Author: piyalidas10

README.md

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 <summary><strong>Angular Dependency Injection</strong></summary>
 
 ### Why Angular 17–19 Moved to ESBuild + Vite ?
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 <summary><strong>How performace is increased from Angular 2 to Latest</strong></summary>
 
 Let’s go deep into how Angular’s performance improved — from Angular 2 → Angular 19 (2025) — across rendering, build, memory, SSR, and runtime execution.