add resource and system requirements

docs/resource-and-system-requirements.md

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+## Resource and System Requirements
+
+### Resource Requirements
+We strongly recommend at least 2 CPUs and 4 GB RAM per worker node in production environment.
+Any less in development environment is ok but will leave little room for your workloads.
+
+### Tested Platforms:
+* CentOS 7.4+ (amd64 and arm64)
+* Ubuntu 18.04+ (amd64 and arm64)
+* Fedora 31 (amd64)  
+* Debian 9.1 (amd64)
+
+Other platforms may work well but are not tested in our production environment. Supplements to the list are welcome.