Add README and documentation.

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2019 Robert Jackson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# release-it-lerna-changelog
+
+This package is a [release-it](https://github.com/release-it/release-it) plugin
+(using [`release-it`'s plugin
+API](https://github.com/release-it/release-it/tree/master/docs/plugins)) that
+integrates [lerna-changelog](https://github.com/lerna/lerna-changelog) into the
+`release-it` pipeline.
+
+## Usage
+
+Installation using your projects normal package manager, for example:
+
+```
+# npm
+npm install --save-dev release-it-lerna-changelog
+
+# yarn add --dev release-it-lerna-changelog
+```
+
+Once installed, configure `release-it` to use the plugin. 
+
+Either via `package.json`:
+
+```json
+{
+  "release-it": {
+    "plugins": {
+      "release-it-lerna-changelog": {}
+    }
+  }
+}
+```
+
+Or via `.release-it.json`:
+
+```json
+{
+  "plugins": {
+    "release-it-lerna-changelog": {}
+  }
+}
+```
+
+## Configuration
+
+`release-it-lerna-changelog` supports one configuration option, `infile`. When
+specified, this option represents the file name to prepend changelog
+information to during a release.
+
+For example, given the following configuration (in `package.json`):
+
+```json
+{
+  "release-it": {
+    "plugins": {
+      "release-it-lerna-changelog": {
+        "infile": "CHANGELOG.md"
+      }
+    }
+  }
+}
+```
+
+Each release will run `lerna-changelog` and prepend the results into `CHANGELOG.md`.
+
+## License
+
+This project is licensed under the [MIT License](LICENSE.md).