Merge pull request inkonchain#30 from jxspinz/UpdateReadme

Add note on how to install Foundry

Author: victorcheeney

README.md

@@ -176,6 +176,8 @@ Will shut down the node and WIPE ALL DATA. Proceed with caution!
 
 Run progress.sh to estimate remaining sync time and speed.
 
+Uses `Cast` command from Foundry tool set. Installation instructions here: https://getfoundry.sh/.
+
 ```sh
 ./progress.sh
 ```