Readme march 2020 (#81)

* changes from upstream

* Update readme

* Update README.md

README.md

@@ -1,2 +1,33 @@
 # ibm-mongodb-operator
-ibm-mongodb-operator
+
+This operator is built to support a larger service offering from IBM called IBM Cloud Platform Common Services. It stands up a mongoDB database that shared by other services within IBM Cloud Platform Common Services. 
+
+## Supported platforms
+
+This is supported on amd64, ppc64le, and s390x. 
+
+## Operator versions
+
+| Version | Date | Details |
+| ----- | ---- | ----------------- |
+| 1.0.0 | March 2020 | Initial Offering of MongoDB operator
+
+## Prerequisites
+
+This operator requires cert-manager, https://github.com/IBM/ibm-cert-manager-operator, be installed in the cluster. The cert-manager operator is also part of the IBM Cloud Platform Common Services. You should be using that offering to install both of these operators. 
+
+## Documentation
+
+For installation and configuration, see the [IBM Knowledge Center](http://ibm.biz/cpcsdocs).
+
+Some notes.
+The operator does not support updating the CR in version 1.0.0. To make changes to a deployed MongoDB instance it is best to edit the statefulset directly.
+
+When deploying MongoDB, it is better to use 3 replicas, especially if you are not backing up your data. It is possible for the data to become corrupt and recovering from a 3 replica deployment is much easier. 
+
+### Developer guide
+
+Information about building and testing the operator.
+- Dev quick start (TO-DO)
+- Debugging the operator (TO-DO)
+