Update README.md

README.md

@@ -2,3 +2,36 @@ ExcelDnaUnpack
 ==============
 
 ExcelDnaUnpack is a command-line utility to extract the contents of ExcelDna add-ins packed with ExcelDnaPack
+
+```
+Usage: ExcelDnaUnpack.exe [<options>]
+
+Where [<options>] is any of:
+
+--xllFile=VALUE    The XLL file to be unpacked; e.g. MyAddIn-packed.xll
+--outFolder=VALUE  [Optional] The folder into which the extracted files will be written; defaults to '.\unpacked'
+--overwrite        [Optional] Allow existing files of the same name to be overwritten
+
+Example: ExcelDnaUnpack.exe --xllFile=MyAddins\FirstAddin-packed.xll
+         The extracted files will be saved to MyAddins\unpacked
+```
+
+## Release History
+
+ * **[v1.0.0](https://github.com/CaioProiete/ExcelDnaUnpack/releases/tag/v1.0.0)** - 2014-12-21
+   - Initial version
+
+## License   
+Copyright 2014 Caio Proiete
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0)
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.