Adds a simple README (#33)

Author: stevapple

README.md

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+# Teco
+
+Teco is an open-source Tencent Cloud SDK for Swift, inspired by [Soto](https://github.com/soto-project/soto).
+
+## Overview
+
+This package provides libraries for accessing public Tencent Cloud APIs. The service APIs it provides are a direct mapping of the APIs Tencent Cloud publishes for each of its services.
+
+## License
+
+Teco is released under the Apache 2.0 license. See [LICENSE.txt](LICENSE.txt) for details.