add readme (#12)

* add readme

README.md

@@ -1,17 +1,29 @@
-## My Project
+## AWS C SDKUTILS
 
-TODO: Fill this README out!
+C99 library implementing AWS SDK specific utilitiies. Includes utilities for ARN
+parsing, reading AWS profiles, etc...
 
-Be sure to:
+## License
 
-* Change the title in this README
-* Edit your repository description on GitHub
+This library is licensed under the Apache 2.0 License.
 
-## Security
+## Usage
 
-See [CONTRIBUTING](CONTRIBUTING.md#security-issue-notifications) for more information.
+### Building
 
-## License
+CMake 3.0+ is required to build.
+
+`<install-path>` must be an absolute path in the following instructions.
+
+
+#### Building aws-c-sdkutils
 
-This project is licensed under the Apache-2.0 License.
+```
+git clone git@github.com:awslabs/aws-c-common.git
+cmake -S aws-c-common -B aws-c-common/build -DCMAKE_INSTALL_PREFIX=<install-path>
+cmake --build aws-c-common/build --target install
 
+git clone git@github.com:awslabs/aws-c-sdkutils.git
+cmake -S aws-c-sdkutils -B aws-c-sdkutils/build -DCMAKE_INSTALL_PREFIX=<install-path> -DCMAKE_PREFIX_PATH=<install-path>
+cmake --build aws-c-sdkutils/build --target install
+```