Add ui-tag.c

This file implements the tag-command, i.e. printing of annotated tags.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -101,6 +101,9 @@ static void cgit_print_repo_page(struct cacheitem *item)
 	case CMD_COMMIT:
 		cgit_print_commit(cgit_query_sha1);
 		break;
+	case CMD_TAG:
+		cgit_print_tag(cgit_query_sha1);
+		break;
 	case CMD_DIFF:
 		cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 		break;