Add prettier, husky and lint-staged

Author: Andrey Okonetchnikov

.husky/.gitignore

@@ -0,0 +1 @@
+_

.husky/pre-commit

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+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx lint-staged

.prettierrc

@@ -0,0 +1,14 @@
+{
+  "overrides": [
+    {
+      "files": "*.md",
+      "options": {
+        "printWidth": 70,
+        "useTabs": false,
+        "trailingComma": "none",
+        "arrowParens": "avoid",
+        "proseWrap": "never"
+      }
+    }
+  ]
+}