update readme

Author: revolist

README.md

@@ -88,10 +88,58 @@ With Yarn:
 yarn add @revolist/angular-datagrid;
 ```
 
-```vue
+```ts
+// app.module.ts
+ 
+import { BrowserModule } from "@angular/platform-browser";
+import { NgModule } from "@angular/core";
+
+import { AppComponent } from "./app.component";
+// import loader
+import {defineCustomElements} from '@revolist/revogrid/loader';
+// import grid
+import {RevoGrid} from '@revolist/angular-datagrid';
+
+// register grid element
+defineCustomElements();
+
+@NgModule({
+  // define component
+  declarations: [AppComponent, RevoGrid],
+  imports: [BrowserModule],
+  providers: [],
+  bootstrap: [AppComponent]
+})
+export class AppModule {}
+```
 
+```ts
+// app.component.ts
+
+import { Component } from "@angular/core";
+
+@Component({
+  selector: "app-root",
+  templateUrl: "./app.component.html",
+  styleUrls: ["./app.component.css"]
+})
+export class AppComponent {
+  columns = [
+    {  name: "Greeting", prop: "name" },
+    { prop: "details" }
+  ];
+  rows = [{ name: "I am", details: "Angular" }, { name: "Hello", details: "Angular" }];
+}
 ```
 
+```html
+<!-- app.component.html -->
+<revo-grid [source]="rows" [columns]="columns" theme="material"></revo-grid>
+
+```
+Check [Sandbox](https://codesandbox.io/s/angular-datagrid-overview-d5i0b?fontsize=14&hidenavigation=1&theme=dark) for real live sample.
+
+
 ## Contributing
 
 If you have any idea, feel free to open an issue to discuss a new feature and submit your changes back to me.