add email requirement to challenge creation

Author: jschwarz2030

.env

@@ -164,3 +164,6 @@ REACT_APP_SERVER_API_KEY=''
 
 # Front-end debugging messages can be enabled, if desired
 REACT_APP_DEBUG='disabled'
+
+# Require Challenge Owners to provide an email
+REACT_APP_EMAIL_ENFORCEMENT='required'

.gitignore

@@ -34,3 +34,8 @@ yarn-debug.log*
 yarn-error.log*
 
 *.swp
+
+#scala plugin
+/.bsp
+/project
+/target