Adds linting rules (#38)

* Adds linting rules

Fixes #27

* Adds pretest script to run linting

Author: bobbyg603

.eslintignore

@@ -0,0 +1,6 @@
+node_modules
+dist
+coverage
+.eslintrc.js
+.vscode
+spec/support

.eslintrc.js

@@ -0,0 +1,31 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint'
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+  rules: {
+    'semi': ['error', 'always'],
+    'object-curly-spacing': ['error', 'always'],
+    'quotes': ['error', 'single'],
+  },
+  overrides: [
+    {
+      'files': ['**/*.spec.ts', '**/*.e2e.ts'],
+      'rules': {
+        '@typescript-eslint/no-explicit-any': 'off'
+      }
+    },
+    {
+      'files': ['spec/fakes/**/*'],
+      'rules': {
+        '@typescript-eslint/no-explicit-any': 'off',
+        '@typescript-eslint/explicit-module-boundary-types': 'off'
+      }
+    }
+  ]
+};