Add README

Author: Kudo

README.md

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+# JavaScript Engine Benchmark for React Native
+
+## Measure Result
+
+[The result will keep to be updated at Google SpreadSheets](https://docs.google.com/spreadsheets/d/1uce3WZ9IaAEUu6Owj3eXEuZb25PDi6ZcgUVV2i500S0/edit#gid=1258377944)
+
+These benchmarks ran on Samsung Galaxy Note 5
+
+## Benchmarks
+
+### React Rendering
+- RenderComponentThroughput
+  
+  The series of test cases aim to measure how many React component could be rendered within some intervals. 
+  
+  - RenderComponentThroughput 10s
+  - RenderComponentThroughput 60s
+  - RenderComponentThroughput 180s
+  
+  The reason that have different interval is that to assume JIT will start to work after longer repetitive executions.
+   
+  **Higher result is better**
+
+### TTI (Time-To-Interaction)
+TBD
+
+## How to Run the Benchmark
+
+Prerequisites:
+
+- Python 3
+- Node 8+
+
+Simply to run
+
+```sh
+python start.py
+```
+## Disclaimer
+
+This project is specific to measure JS engine performance for React Native. It is not designated to do generic JS engine comparison.
+
+For example, on React Native Android, we don't enable all JIT tiers on JavaScriptCore. On V8, I am currently trying to use the JIT-less mode. What I am trying to do is balancing between good enough performance, low memory usage, and small binary size. That is why to disable JIT sometimes.
+