chore(docs): Aztec.nr logging page (#3281)

docs/docs/dev_docs/debugging/main.md

@@ -6,4 +6,31 @@ import DocCardList from '@theme/DocCardList';
 
 On this section you can learn how to debug your Aztec.nr smart contracts and common errors that you may run into.
 
+# Logging in Aztec.nr
+
+You can log statements from Aztec.nr contracts that will show ups in the Sanbox.
+
+**Import debug_log**
+Import the [`debug_log`](https://github.com/AztecProtocol/aztec-packages/blob/master/yarn-project/aztec-nr/aztec/src/oracle/debug_log.nr) dependency from Aztec oracles:
+
+```rust
+use dep::aztec::oracle::debug_log::{ debug_log };
+```
+
+**Write log**
+Write `debug_log()` in the appropriate place in your contract. 
+
+```rust
+debug_log("here")
+```
+
+**Start Sandbox in debug mode**
+
+Prepend the command to start the sandbox with `DEBUG=aztec` to log everything or `DEBUG=aztec:simulator:oracle` to only log your `debug_log()` statements.
+
+```bash
+cd ~./aztec && DEBUG=aztec docker-compose up
+```
+
+
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