Create a first-cut for a README for http package

pkg/http/README.md

Index: pkg/http/README.md
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+# http
+
+A composable, Future-based library for making HTTP requests.
+
+This package contains a set of high-level functions and classes that make it
+easy to consume HTTP resources.
+
+**NOTE:** This package currently only works for
+server-side or command-line Dart applications. In other words, if the app
+imports `dart:io`, it can use this package.
+
+## Using
+
+Please see the [API docs][docs] for explanations and examples.
+
+## Filing issues
+
+Please file issues for the http package at [http://dartbug.com/new][bugs].
+
+[bugs]: http://dartbug.com/new
+[docs]: https://api.dartlang.org/docs/channels/dev/latest/http.html