added README

Change-Id: Ib6943d553b5f889bb78a283cc3cdfeac6a863552
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..61835fd
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# Apache Maven Aggregator
+
+Manifest to fetch every Apache Maven git repositories using [Google repo](https://source.android.com/source/using-repo).
+
+## Bootstrapping Basics
+
+```
+mkdir maven
+cd maven
+repo init -u https://github.com/hboutemy/maven-aggregator.git
+repo sync
+repo start master --all
+```
+
+Then simply use the cloned content with normal `git` commands.
diff --git a/default.xml b/default.xml
index fbd97e7..cdc24be 100644
--- a/default.xml
+++ b/default.xml
@@ -2,7 +2,7 @@
 <manifest>
   <remote name='gitbox' fetch='https://gitbox.apache.org/repos/asf' />
   <remote name='gitwip' fetch='https://git-wip-us.apache.org/repos/asf' />
-  <default revision='master' remote='gitbox' />
+  <default revision='master' remote='gitbox' sync-j='8' />
 
   <project path='archetype'             name='maven-archetype.git' remote='gitwip' />
   <project path='core/maven'            name='maven.git' remote='gitwip' />