Create README.md

Author: benjchristensen

rxjava-contrib/rxjava-apache-http/README.md

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+# rxjava-apache-http
+
+Observable API for Apache [HttpAsyncClient](http://hc.apache.org/httpcomponents-asyncclient-dev/)
+
+It is aware of Content-Type `text/event-stream` and will stream each event via `Observer.onNext`.
+
+Other Content-Types will be returned as a single call to `Observer.onNext`.
+
+Main Classes:
+
+- (ObservableHttp)[https://github.com/Netflix/RxJava/blob/master/rxjava-contrib/rxjava-apache-http/src/main/java/rx/apache/http/ObservableHttp.java]
+- (ObservableHttpResponse)[https://github.com/Netflix/RxJava/blob/master/rxjava-contrib/rxjava-apache-http/src/main/java/rx/apache/http/ObservableHttpResponse.java]
+
+
+# Binaries
+
+Binaries and dependency information for Maven, Ivy, Gradle and others can be found at [http://search.maven.org](http://search.maven.org/#search%7Cga%7C1%7Ccom.netflix.rxjava).
+
+Example for [Maven](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22rxjava-apache-http%22):
+
+```xml
+<dependency>
+    <groupId>com.netflix.rxjava</groupId>
+    <artifactId>rxjava-apache-http</artifactId>
+    <version>x.y.z</version>
+</dependency>
+```
+
+and for Ivy:
+
+```xml
+<dependency org="com.netflix.rxjava" name="rxjava-apache-http" rev="x.y.z" />
+```
+
+# Sample usage