improve docs insprired by graphhopper#1004

Author: karussell

README.md

@@ -83,8 +83,18 @@ Windows, BSD, Solaris, Raspberry Pi, Android, Blackberry and even iOS.
 
 ### Maven
 
-Embed the core of GraphHopper into your Java application via the following
-snippet
+Embed GraphHopper with OpenStreetMap support into your Java application via the following snippet
+
+```xml
+<dependency>
+    <groupId>com.graphhopper</groupId>
+    <artifactId>graphhopper-reader-osm</artifactId>
+    <version>0.8.2</version>
+</dependency>
+```
+
+If you want to customize the import process or you don't need OSM import like
+on [Android](./docs/android/index.md), then use:
 
 ```xml
 <dependency>

docs/core/routing.md

@@ -1,5 +1,8 @@
 # Routing via Java API
 
+To use the following examples you need to specify the dependency in
+your [Maven config](/README.md#Maven) correctly.
+
 To do routing in your Java code you'll need just a few lines of code:
 
 ```java