Add {README,CONTRIBUTING}.md

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

README.md

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+# kubectx(1)
+
+kubectx is an utility to manage and switch between kubectl(1) contexts.
+
+```
+USAGE:
+  kubectx                   : list the contexts
+  kubectx <NAME>            : switch to context
+  kubectx -                 : switch to the previous context
+  kubectx <NEW_NAME>=<NAME> : create alias for context
+  kubectx -h,--help         : show this message
+```
+
+## Example
+
+```
+$ kubectx minikube
+Switched to context "minikube".
+
+$ kubectx -
+Switched to context "oregon".
+
+$ kubectx -
+Switched to context "minikube".
+
+$ kubectx dublin=gke_ahmetb_europe-west1-b_dublin
+Context "dublin" set.
+Aliased "gke_ahmetb_europe-west1-b_dublin" as "dublin".
+```
+
+-----
+
+Disclaimer: This is not an official Google product.