separate out config out of package.json into their own files

Author: mohsinulhaq

.browserslistrc

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+>0.2%
+not dead
+not ie <= 11
+not op_mini all

.eslintignore

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+dist/
+lib/
+docs/
+coverage/

.eslintrc.json

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+{
+  "parser": "babel-eslint",
+  "env": {
+    "browser": true,
+    "es6": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:react/recommended",
+    "plugin:jsx-a11y/recommended",
+    "plugin:jest/recommended",
+    "plugin:prettier/recommended"
+  ],
+  "parserOptions": {
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "plugins": ["react", "jsx-a11y", "jest"],
+  "rules": {
+    "indent": ["error", 2],
+    "linebreak-style": ["error", "unix"],
+    "quotes": ["error", "single"],
+    "semi": ["error", "always"]
+  },
+  "settings": {
+    "react": {
+      "version": "detect"
+    }
+  }
+}

.prettierrc

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+{
+  "singleQuote": true,
+  "bracketSpacing": false
+}