Update README.md

Author: gkamradt

README.md

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-# langchain-tutorials
-Overview and tutorial of the LangChain Library
+# LangChain Tutorials
+
+Overview and tutorial of the [LangChain library](https://langchain.readthedocs.io/en/latest/)
+
+See the accompanying YouTube tutorials @
+
+If you want to get updated when new tutorials are out, sign up at [DataIndependent](www.dataindependent.com)
+
+This series is provided by and associated with [DataIndependent](www.dataindependent.com)