docs: add ngx-grid (#895)

Author: jdegand

README.md

@@ -973,6 +973,7 @@ become an Angular expert.
 * [revogrid](https://github.com/revolist/revogrid) - Powerful virtual data grid smartsheet with advanced customization. Best features from Excel plus incredible performance.
 * [ZingGrid](https://www.zinggrid.com/docs/integrations/js-frameworks-&-libs/angular) - [ZingGrid](https://github.com/ZingGrid/zinggrid) is a JavaScript Web Component Library that allows developers to include interactive data tables in their web applications. The library can also be used in popular frameworks such as React, Angular, Vue, jQuery, and many more!
 * [ngx-panemu-table](https://github.com/panemu/ngx-panemu-table) - An Angular table component. It is designed to be easy to use. Most work will be in TypeScript file, while the HTML file only needs to have a very simple `panemu-table` tag.
+* [ngx-grid](https://github.com/blueshiftone/ngx-grid) - A professional Angular data grid.
 
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