init: Start dotfiles with a test container to verify installation.

.gitconfig

@@ -0,0 +1,18 @@
+[user]
+    email = matthew@binning.dev
+    name = Matthew Binning
+[diff]
+    tool = vimdiff
+[difftool]
+    prompt = false
+[difftool "sdiff"]
+    cmd = cmddiff $LOCAL $REMOTE
+[merge]
+    tool = fugitive
+[alias]
+    df = difftool
+    sdiff = difftool --ignore-submodules --tool=sdiff
+[mergetool]
+    prompt = false
+[mergetool "fugitive"]
+    cmd = vim -f -c \"Gvdiff\" \"$MERGED\"