Add linter

.eslintrc.json

@@ -0,0 +1,27 @@
+{
+    "env": {
+      "es6": true,
+      "node": true,
+      "mocha": true,
+      "browser": true
+    },
+    "extends": [
+      "plugin:@typescript-eslint/recommended",
+      "eslint:recommended"
+    ],
+    "parser": "@typescript-eslint/parser",
+    "parserOptions": {
+      "project": "./tsconfig.json",
+      "sourceType": "module"
+    },
+    "rules": {
+      "@typescript-eslint/explicit-module-boundary-types": "off",
+      "@typescript-eslint/no-explicit-any": "off",
+      "no-redeclare": "off",
+      "no-unused-vars": "off",
+      "prefer-const": ["error", {"destructuring": "all"}],
+      "semi": ["error", "never"],
+      "no-extra-semi": "off",
+      "@typescript-eslint/no-extra-semi": "off"
+    }
+  }

.prettierrc.json

@@ -0,0 +1,19 @@
+{
+    "singleQuote": true,
+    "printWidth": 120,
+    "bracketSpacing": true,
+    "overrides": [
+      {
+        "files": ["*.ts","*.tsx"],
+        "options": {
+          "semi": false
+        }
+      },
+      {
+        "files": ["*.sol"],
+        "options": {
+          "semi": true
+        }
+      }
+    ]
+  }