diff --git a/README.md b/README.md
index 93ce243..6648be2 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,19 @@
 # prettier-config-freee
+
 Shared configuration for prettier in freee.
+
+## Installation
+
+```sh
+# npm
+npm install prettier-config-freee -D -E
+
+# yarn
+yarn add prettier-config-freee -D -E
+```
+
+Then add it to your `package.json`
+
+```js
+"prettier": "prettier-config-freee"
+```
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..60e626c
--- /dev/null
+++ b/index.js
@@ -0,0 +1,11 @@
+module.exports = {
+  $schema: 'http://json.schemastore.org/prettierrc',
+  endOfLine: 'lf',
+  jsxBracketSameLine: false,
+  printWidth: 80,
+  semi: true,
+  singleQuote: true,
+  tabWidth: 2,
+  trailingComma: 'none',
+  useTabs: false
+};
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..a028a1c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "prettier-config-freee",
+  "version": "1.0.0",
+  "description": "Shared configuration for prettier in freee.",
+  "main": "index.js",
+  "scripts": {},
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/freee/prettier-config-freee.git"
+  },
+  "author": "freee",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/freee/prettier-config-freee/issues"
+  },
+  "homepage": "https://github.com/freee/prettier-config-freee#readme"
+}