Add a blog post to announce grpc-js 1.0 (#197)

* Add a blog post to announce grpc-js 1.0

* Add metadata, remove title header

* Put title in quotes

* Address comments

content/blog/grpc-js-1.0.md

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+---
+title: Announcing gRPC-JS 1.0
+date: 2020-04-20
+author:
+  name: Michael Lumish
+  link: https://github.com/murgatroid99
+---
+
+We are excited to announce the release of version 1.0 of gRPC-JS
+([@grpc/grpc-js](https://www.npmjs.com/package/@grpc/grpc-js)),
+a pure-TypeScript reimplementation of the original Node gRPC library,
+[grpc](https://www.npmjs.com/package/grpc).
+
+## Features
+
+gRPC-JS supports the following features, which should cover most use cases:
+
++   Clients
++   Automatic reconnection
++   Servers
++   Streaming
++   Metadata
++   Partial compression support: clients can decompress response messages
++   Pick first and round robin load balancing policies
++   Client Interceptors
++   Connection Keepalives
++   HTTP Connect support (proxies)
+
+## Should I use `@grpc/grpc-js` or `grpc`?
+
+The original Node.js gRPC library ([grpc](https://www.npmjs.com/package/grpc)) has been deprecated,
+so we recommend that you use ([@grpc/grpc-js](https://www.npmjs.com/package/@grpc/grpc-js)).
+
+However, some advanced features haven't been ported to gRPC-JS yet,
+such as full compression support or support for other load balancing policies.
+If you need one of these features, you should use the original Node `grpc` library,
+but file a [feature request](https://github.com/grpc/grpc-node/issues/new?template=feature_request.md)
+for gRPC-JS to let us know which features you are missing the most.