SQOOP-3427 Add Travis badge to the README

Author: Fokko Driesprong

README.md

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+[![Build Status](https://travis-ci.org/apache/sqoop.svg?branch=trunk)](https://travis-ci.org/apache/sqoop)
+
+# Welcome to Sqoop!
+
+This is the Sqoop (SQL-to-Hadoop) tool. Sqoop allows easy imports and
+exports of data sets between databases and HDFS.
+
+## More Documentation
+
+Sqoop ships with additional documentation: a user guide and a manual page.
+
+Asciidoc sources for both of these are in +src/docs/+. Run +ant docs+ to build
+the documentation. It will be created in +build/docs/+.
+
+If you got Sqoop in release form, documentation will already be built and
+available in the +docs/+ directory.
+
+## Compiling Sqoop
+
+Compiling Sqoop requires the following tools:
+
+* Apache ant (1.9.7)
+* Java JDK 1.8
+
+Additionally, building the documentation requires these tools:
+
+* asciidoc
+* make
+* python 2.5+
+* xmlto
+* tar
+* gzip
+
+To compile Sqoop, run +ant package+. There will be a fully self-hosted build
+provided in the +build/sqoop-(version)/+ directory.
+
+You can build just the jar by running +ant jar+.
+
+See the COMPILING.txt document for for information.
+
+## This is also an Asciidoc file!
+
+* Try running +asciidoc README.txt+
+* For more information about asciidoc, see http://www.methods.co.nz/asciidoc/