Add readme

README.md

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+# prettier-default-config
+
+This is a small CLI tool that dumps all of prettier's default configuration
+options to a file in the format of your choice.
+
+## Installation
+
+```
+npm install -g prettier-default-config
+```
+
+## Usage
+
+```
+USAGE
+    prettier-default-config [OPTIONS]
+
+OPTIONS:
+    --format <FORMAT> The config file format to generate.
+                      <json|yaml|toml|js|package.json>
+                      default: json
+
+    --stdout          Write config to STDOUT rather than to a file
+
+    --help            Prints help information
+```
+
+## License
+
+MIT