add react support into lib

docs/frameworks/angular.md

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+# Angular
+
+## Installation
+Angular [plays nice](https://custom-elements-everywhere.com/#angular) with custom elements. Just make sure to apply the custom elements schema as shown below.
+
+```js
+import { BrowserModule } from '@angular/platform-browser';
+import { NgModule, CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
+
+import { AppComponent } from './app.component';
+
+@NgModule({
+  declarations: [AppComponent],
+  imports: [BrowserModule],
+  providers: [],
+  bootstrap: [AppComponent],
+  schemas: [CUSTOM_ELEMENTS_SCHEMA]
+})
+export class AppModule {}
+```
+
+?> Are you using Shoelace with Angular? This page could use some love. [Please help us improve it!](https://github.com/shoelace-style/shoelace/blob/next/docs/frameworks/angular.md)