add sdk onramp course to courses

SDKOnramp/README.md

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+# Onramp Curriculum
+
+A series of notebook tutorials that cover the essentials of working with Claude and the Claude SDK including:
+
+* [Getting an API key and making simple requests](./01_getting_started.ipynb)
+* [Working with the messages format](./02_messages_format.ipynb)
+* [Comparing capabilities and performance of the Claude model family](./03_models.ipynb)
+* [Understanding model parameters](./04_parameters.ipynb)
+* [Working with streaming responses](./05_Streaming.ipynb)
+* [Vision prompting](./06_multimodal.ipynb)