Update CODE_OF_CONDUCT.md

Adding secret code so users in our community onboarding flows and contests can find it. This will bring some additional attention the repo 🙏

Author: cuevasm

CODE_OF_CONDUCT.md

@@ -71,6 +71,9 @@ Community leaders will follow these Community Impact Guidelines in determining t
 
 **Consequence**: A permanent ban from any sort of public interaction within the community.
 
+### Secret Code: 
+The code to the contest is: BITCOINL2
+
 ## Attribution
 
 This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 2.0,