Initial documentation

[NOBLES5E]

• [x] Introduction @Tengxu-Sun
• [x] Installation (MPI and CMake) @liuhatry
  • [x] Ubuntu
  • [x] CentOS
• [x] Getting started @wangraying
• [x] Elastic training @shjwudp
• [x] Quantized AllReduce @NOBLES5E
• [x] Decentralized @ganshaoduo
• [x] 1bit Adam @ganshaoduo
• [x] Autotune @shjwudp
• [x] Benchmarks @Tengxu-Sun @ganshaoduo
• [x] FAQ @Tengxu-Sun
• [x] Troubleshooting @Tengxu-Sun
• [x] Contributing: How to develop a new algorithm @ganshaoduo
• [x] Kubernetes operations @kinglion811
• [x] Additional utils like load balancing data loader
  • [x] load balance data loader @NOBLES5E
  • [x] fused optimizer @NOBLES5E

[NOBLES5E]

Cheers!