add tooling setup

Author: geekysrm

04-code-quality-tooling.md

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+## Code Quality Tooling
+
+- We use *ESLint* and *Prettier*.
+- **ESLint**: Javascript linting tool for identifying and reporting potential issues  in code. e.g. bad practices and design patterns.
+- **Prettier**: Formats code.
+
+Follow this guide for tooling setup: https://github.com/wesbos/eslint-config-wesbos.