add prettier and solhint

.gitignore

@@ -1,3 +1,5 @@
+node_modules
+
 out/
 cache/
 .env

.solhint.json

@@ -0,0 +1,20 @@
+{
+    "extends": "solhint:recommended",
+    "plugins": ["prettier"],
+    "rules": {
+      "code-complexity": ["error", 8],
+      "compiler-version": ["error", ">=0.5.8"],
+      "const-name-snakecase": "off",
+      "constructor-syntax": "error",
+      "func-visibility": ["error", { "ignoreConstructors": true }],
+      "max-line-length": ["error", 120],
+      "not-rely-on-time": "off",
+      "prettier/prettier": [
+        "error",
+        {
+          "endOfLine": "auto"
+        }
+      ],
+      "reason-string": ["warn", { "maxLength": 64 }]
+    }
+  }

package.json

@@ -0,0 +1,23 @@
+{
+    "name": "reverse-liquidity-split",
+    "author": "Axxe",
+    "license": "MIT",
+    "version": "1.0.0",
+    "files": [
+      "*.sol"
+    ],
+    "devDependencies": {
+      "prettier": "^2.4.1",
+      "prettier-plugin-solidity": "^1.0.0-beta.18",
+      "solhint": "^3.3.6",
+      "solhint-plugin-prettier": "^0.0.5"
+    },
+    "scripts": {
+      "lint": "yarn prettier && yarn solhint",
+      "lint:check": "yarn prettier:check && yarn solhint:check",
+      "prettier": "yarn prettier:check --write",
+      "prettier:check": "prettier --check \"src/**/*.sol\"",
+      "solhint": "yarn solhint:check --fix",
+      "solhint:check": "solhint --config ./.solhint.json \"src/**/*.sol\""
+    }
+  }