add github actions, rubocop, stickler and styelint

.github/workflows/linters.yml

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+name: Linters
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  lighthouse:
+    name: Lighthouse
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Setup Lighthouse
+        run: npm install -g @lhci/[email protected]
+      - name: Lighthouse Report
+        run: lhci autorun --upload.target=temporary-public-storage --collect.staticDistDir=.
+  webhint:
+    name: Webhint
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Setup Webhint 
+        run: |
+          npm install --save-dev [email protected]
+          [ -f .hintrc ] || wget https://raw.githubusercontent.com/microverseinc/linters-config/master/html-css/.hintrc
+      - name: Webhint Report
+        run: npx hint --telemetry=off .
+  stylelint:
+    name: Stylelint
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+      - name: Setup Stylelint
+        run: |
+
+          npm install --save-dev [email protected] [email protected] [email protected] stylelint-csstree-validator
+          [ -f .stylelintrc.json ] || wget https://raw.githubusercontent.com/microverseinc/linters-config/master/ror/.stylelintrc.json
+
+      - name: Stylelint Report
+        run: npx stylelint "**/*.{css,scss}"

.rubocop.yml

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+AllCops:
+  Exclude:
+    - "db/**/*"
+    - "bin/*" 
+    - "config/**/*"
+    - "Guardfile"
+    - "Rakefile"
+    - "README.md"
+    - "node_modules/**/*"
+
+  DisplayCopNames: true
+
+Layout/LineLength:
+  Max: 120
+Metrics/MethodLength:
+  Include:
+    - "app/controllers/*"
+    - "app/models/*"
+  Max: 20
+Metrics/AbcSize:
+  Include:
+    - "app/controllers/*"
+    - "app/models/*"
+  Max: 50
+Metrics/ClassLength:
+  Max: 150
+Metrics/BlockLength:
+  ExcludedMethods: ['describe']
+  Max: 30
+
+Style/Documentation:
+  Enabled: false
+Style/ClassAndModuleChildren:
+  Enabled: false
+Style/EachForSimpleLoop:
+  Enabled: false
+Style/AndOr:
+  Enabled: false
+Style/DefWithParentheses:
+  Enabled: false
+Style/FrozenStringLiteralComment:
+  EnforcedStyle: never
+
+Layout/HashAlignment:
+  EnforcedColonStyle: key
+Layout/ExtraSpacing:
+  AllowForAlignment: false
+Layout/MultilineMethodCallIndentation:
+  Enabled: true
+  EnforcedStyle: indented

.stickler.yml

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+# add the linters you want stickler to use for this project
+linters:
+  rubocop:
+    display_cop_names: true
+    # indicate where is the config file for stylelint
+    config: './rubocop.yml'
+
+# add the files here you want to be ignored by stylelint
+files:
+  ignore:
+    - "bin/*"
+    - "db/*"
+    - "config/*"
+    - "Guardfile"
+    - "Rakefile"
+    - "README.md"
+    - "node_modules/**/*"
+
+# PLEASE DO NOT enable auto fixing options
+# if you need extra support from you linter - do it in your local env as described in README for this config
+
+# find full documentation here: https://stickler-ci.com/docs

.stylelintrc.json

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+{
+  "extends": ["stylelint-config-standard"],
+  "plugins": ["stylelint-scss"],
+  "rules": {
+    "at-rule-no-unknown": null,
+    "scss/at-rule-no-unknown": true
+  },
+  "ignoreFiles": [
+    "build/**",
+    "dist/**",
+    "**/reset*.css",
+    "**/bootstrap*.css"
+  ]
+}