[Add] hengband.xtra を lib/xtra にサブモジュールとして追加

https://github.com/hengband/hengband.xtra を lib/xtra にサブモジュールとして
追加する。

diff --git a/.gitmodules b/.gitmodules
new file mode 100644 (file)
index 0000000..0219e39
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "lib/xtra"]
+       path = lib/xtra
+       url = https://github.com/hengband/hengband.xtra
+       ignore = dirty

diff --git a/lib/xtra b/lib/xtra
new file mode 160000 (submodule)
index 0000000..224dc2e
--- /dev/null
+++ b/lib/xtra
@@ -0,0 +1 @@
+Subproject commit 224dc2ed2af02791fbe6818fbd8b36874c965697