Add linting files

.eslintignore

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+/src/registerServiceWorker.js
+node_modules
+build
+/coverage/

.eslintrc

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+{
+  "extends": ["react"],
+  "env": {
+    "browser": true,
+    "es6": true,
+    "jest": true
+  },
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 8,
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true,
+      "jsx": true
+    }
+  },
+  "rules": {
+    "indent": ["error", 2],
+    "react/jsx-curly-spacing": [
+      "error",
+      {
+      "when": "always",
+      "children": true,
+      "spacing": { "objectLiterals": "never" }
+      }
+    ],
+  }
+}

.sass-lint.yml

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+options:
+  max-warnings: 50
+files:
+  include: 'src/**/*.s+(a|c)ss'
+  ignore:
+    - 'node_modules/**/*.*'
+rules:
+  no-vendor-prefixes: 1
+  no-ids: 0
+  property-sort-order: 0
+  empty-line-between-blocks: 1
+  class-name-format: 0
+  leading-zero: 0
+  nesting-depth:
+    - 1
+    -
+      max-depth: 4
+  quotes:
+    - 1
+    -
+      style: double
+  no-duplicate-properties: 1
+  no-important: 0
+  mixins-before-declarations: 0
+  extends-before-mixins: 2
+  extends-before-declarations: 2
+  placeholder-in-extend: 2
+  no-misspelled-properties: 1
+  no-mergeable-selectors: 0
+pseudo-element: 0