feat: add spec for commands/mapping

spec/commands/mapping_create_spec.cr

@@ -0,0 +1,7 @@
+require "../spec_helper"
+require "../../src/commands/mapping_create"
+
+describe GX::Commands::MappingCreate do
+  context "Initialization" do
+  end
+end

spec/commands/mapping_edit_spec.cr

@@ -0,0 +1,7 @@
+require "../spec_helper"
+require "../../src/commands/mapping_edit"
+
+describe GX::Commands::MappingEdit do
+  context "Initialization" do
+  end
+end

spec/commands/mapping_list_spec.cr

@@ -0,0 +1,7 @@
+require "../spec_helper"
+require "../../src/commands/mapping_list"
+
+describe GX::Commands::MappingList do
+  context "Initialization" do
+  end
+end