Adding readme and ignores

example/kubernetes/using-secrets/.gitignore

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+ldap-secret.yaml

example/kubernetes/using-secrets/README.md

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+# Generating ldap-secret.yaml
+
+`make example`
+
+Then edit the yaml files in the environment directory to have the desired paraneters, and then make the secret file:
+
+`make ldap-secret.yaml`

example/kubernetes/using-secrets/environment/.gitignore

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+my-env.startup.yaml
+my-env.yaml