Add grpc-js-xds README

packages/grpc-js-xds/README.md

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+# @grpc/grpc-js xDS plugin
+
+This package provides support for the `xds://` URL scheme to the `@grpc/grpc-js` library. The latest version of this package is compatible with `@grpc/grpc-js` version 1.2.x.
+
+## Installation
+
+```
+npm install @grpc/grpc-js-xds
+```
+
+## Usage
+
+```ts
+import * as grpcJsXds from '@grpc/grpc-js-xds';
+grpcJsXds.register();
+
+// ...get a @grpc/grpc-js Client class as usual
+
+const client = new MyServiceClient('xds:///example.com:123');
+```
+
+## Supported Features
+
+ - [xDS-Based Global Load Balancing](https://github.com/grpc/proposal/blob/master/A27-xds-global-load-balancing.md)