Added a simple level to configure the default editor for git

levels/core_editor.rb

@@ -0,0 +1,29 @@
+difficulty 1
+description "Set up your git default editor, this is important for editing commits, fixing merge conflicts and rebases. Or maybe you just like nano, we don't discriminate."
+
+setup do
+  repo.init
+end
+
+solution do
+  valid = false
+
+  editor = request("What is your default editor for git?")
+  config_editor = repo.config["core.editor"]
+
+  if editor.respond_to?(:force_encoding)
+    config_editor = config_editor.force_encoding("UTF-8")
+  end
+
+  if editor == config_editor 
+    valid = true
+  end
+
+  puts "Your config has the following core editor: #{config_editor}"
+
+  valid
+end
+
+hint do
+  puts "These settings are config settings. You should run `git help config` if you are stuck. In case you'd like to know what you're doing: man git-commit"
+end

lib/githug/level.rb

@@ -2,7 +2,7 @@ module Githug
   class Level
     include UI
 
-    LEVELS = [nil, "init", "config", "add", "commit", "clone",
+    LEVELS = [nil, "init", "config", "core_editor", "add", "commit", "clone",
               "clone_to_folder", "ignore", "include", "status",
               "number_of_files_committed", "rm", "rm_cached", "stash", "rename",
               "restructure", "log", "tag", "push_tags", "commit_amend",