Added docs/README.md

docs/README.md

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+### User documentation
+- <span style="color:red">***Note that the User Manual has not yet been updated to reflect changes made for v2.0.0-Release-20240424. However the examples and control files have been updated to reflect the latest changes to the code.***</span>
+- [*User Manual*](GA-AEM_Programs_User_Manual.pdf).
+- [*Theoretical details for GALEISBSTDEM*](GALEISBSTDEM_Inversion_Algorithm_Theoretical_Details.pdf).