Created a new synchronous http client using RawSynchronousSockets.

README.md

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+Dart Synchronous HTTP Client
+============================
+
+A simple Dart HTTP client implemented using RawSynchronousSockets to allow for
+synchronous HTTP requests.
+
+Warning: This library should probably only be used to connect to HTTP servers
+that are hosted on 'localhost'. The operations in this library will block the
+calling thread to wait for a response from the HTTP server. The thread can
+process no other events while waiting for the server to respond. As such, this
+synchronous HTTP client library is not suitable for applications that require
+high performance. Instead, such applications should use libraries built on
+asynchronous I/O, including
+[dart:io](https://api.dartlang.org/stable/1.22.1/dart-io/dart-io-library.html)
+and [package:http](https://pub.dartlang.org/packages/http), for the best
+performance.