Add READMEs for the Spark components

Add a README file to each Spark component referring to the root README.
21guns · Jan 4, 2016 · f9c4c4e · f9c4c4e
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diff --git a/base/README.md b/base/README.md
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+# Spark base
+
+The Spark base image serves as a base image for the Spark master, Spark worker and Spark submit images. The user should not run this image directly. See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark) for more information.
diff --git a/master/README.md b/master/README.md
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+# Spark master
+
+See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark).
diff --git a/submit/README.md b/submit/README.md
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+# Spark submit
+
+The Spark submit image serves as a base image to submit your application on a Spark cluster. See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark) for a description how to extend this image.
diff --git a/worker/README.md b/worker/README.md
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+# Spark worker
+
+See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark).
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		# Spark base

		The Spark base image serves as a base image for the Spark master, Spark worker and Spark submit images. The user should not run this image directly. See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark) for more information.
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		# Spark master

		See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark).
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		# Spark submit

		The Spark submit image serves as a base image to submit your application on a Spark cluster. See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark) for a description how to extend this image.
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		# Spark worker

		See [big-data-europe/docker-spark README](https://github.com/big-data-europe/docker-spark).