memcached-operator: add memcached-operator example (#25)

* memcached-operator: add memcached-operator example

This is based on the example in the operator-sdk user-guide and also
includes example tests using the test framework.

* test/e2e/memcached_test.go: modify imports

* README.md: add readme

Author: AlexNPavel

memcached-operator/.gitignore

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+
+# Temporary Build Files
+tmp/_output
+tmp/_test
+
+
+# Created by https://www.gitignore.io/api/go,vim,emacs,visualstudiocode
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+### Emacs ###
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