Add ESLint and prettier formatting

Author: ericallam

.eslintignore

@@ -0,0 +1,2 @@
+node_modules
+lib

.eslintrc

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+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint", "prettier"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+  ],
+  "rules": {
+    "prettier/prettier": 2
+  }
+}

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": false,
+  "printWidth": 100
+}