feat: start implementing MappingCreate

src/commands/mapping_create.cr

@@ -2,11 +2,15 @@ require "./abstract_command"
 
 module GX::Commands
   class MappingCreate < AbstractCommand
-    def initialize(config : GX::Config) # FIXME
+    def initialize(@config : GX::Config) # FIXME
+      @config.load_from_env
+      @config.load_from_file
+      @file_system_manager = FileSystemManager.new(@config)
     end
 
     def execute
       # FIXME: implement
+      puts "mapping create yo!"
     end
 
     def self.handles_mode