add more descriptions to evm_opcodes & update readme

Author: bohendo

learn_evm/README.md

@@ -6,3 +6,5 @@ List of EVM technical knowledge
   - [Forks <> CIPs](cips_forks.md): Summarize the CIPs and EIPs included in each Celo fork *(EVM-compatible chain)*
   - [Upgrades <> TIPs](tips_upgrades.md): Summarize the TIPs included in each TRON upgrade *(EVM-compatible chain)*
   - [Forks <> BEPs](beps_forks.md): Summarize the BEPs included in each BSC fork *(EVM-compatible chain)*
+- [Yellow Paper Guidance](yellow-paper.md): Symbol reference for more easily reading the Ethereum yellow paper
+- [Transaction Tracing](tracing.md): Helper scripts and guidance for generating and navigating transaction traces