feat: added updraft as a general resource

Author: PatrickAlphaC

docs/resources.rst

@@ -15,6 +15,7 @@ General Resources
 * `awesome-solidity <https://github.com/bkrem/awesome-solidity>`_
 * `Solidity by Example <https://solidity-by-example.org/>`_
 * `Solidity documentation community translations <https://github.com/solidity-docs>`_
+* `Solidity Smart Contract Course <https://updraft.cyfrin.io/courses/solidity>`_
 
 Integrated (Ethereum) Development Environments
 ==============================================