Add submodule build-aux.

	修改：     ChangeLog
	新文件：   setup.cmd
	新文件：   setup.sh

Author: ChenPi11

ChangeLog

@@ -1,6 +1,7 @@
 2023-08-08  ChenPi11  <wushengwuxi-msctinoulk@outlook.com>
 
     Add CMake buildsystem support.
+    Add submodule 'build-aux'.
 
 2023-08-07  ChenPi11  <wushengwuxi-msctinoulk@outlook.com>
 

setup.cmd

@@ -0,0 +1,42 @@
+@echo off
+rem Setup a repository during individual development.
+rem
+rem This script requires git program in the PATH.
+
+rem Copyright (C) 2023 The C++ Plus Project.
+rem
+rem This program is free software: you can redistribute it and/or modify
+rem it under the terms of the GNU Lesser General Public License as published by
+rem the Free Software Foundation; either version 3 of the License, or
+rem (at your option) any later version.
+rem
+rem This program is distributed in the hope that it will be useful,
+rem but WITHOUT ANY WARRANTY; without even the implied warranty of
+rem MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+rem GNU Lesser General Public License for more details.
+rem
+rem You should have received a copy of the GNU Lesser General Public License
+rem along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+rem Usage: setup.cmd
+
+if exist .\build-aux (
+    echo Success: '.\build-aux' is exists, please don't remove it, and you can develop this package normally.
+    goto QUIT
+)
+
+if exist ..\build-aux (
+    echo Success: '..\build-aux' is exists, please don't remove it, and you can develop this package normally.
+    goto QUIT
+)
+
+echo Notice: '..\build-aux' for C++ Plus are not exists, cloning it......
+git clone https://github.com/cppp-project/build-aux
+if %errorlevel%==0 (
+    echo Success: '.\build-aux' cloned successfully, please don't remove it, and you can develop this package normally.
+) else (
+    echo Error: .\build-aux' cloned failed, you can clone it by yourself or copy it from C++ Plus release source package.
+    echo Notice: try to run 'git clone https://github.com/cppp-project/build-aux'.
+)
+
+:QUIT

setup.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env sh
+# Setup a repository during individual development.
+#
+# This script requires git program in the PATH.
+
+# Copyright (C) 2023 The C++ Plus Project.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# Usage: ./setup.sh
+# 
+
+# Usage: text_out [color_id] [level] [msg]
+text_out()
+{
+  echo "\033[$1m$2: $3 \033[0m"
+}
+
+# Usage: execute [command]
+execute()
+{
+  text_out 94 "$1"
+  $1
+  return $?
+}
+
+if test -d './build-aux'
+then
+  text_out 32 "Success" "'./build-aux' is exists, please don't remove it, and you can develop this package normally."
+  exit 0
+fi
+
+if test -d '../build-aux'
+then
+  text_out 32 "Success" "'../build-aux' is exists, please don't remove it, and you can develop this package normally."
+  exit 0
+fi
+
+text_out 0 "Notice" "'../build-aux' for C++ Plus are not exists, cloning it......"
+execute "git clone https://github.com/cppp-project/build-aux"
+if [ $? -eq 0 ]
+then
+  text_out 32 "Success" "'./build-aux' cloned successfully, please don't remove it, and you can develop this package normally."
+else
+  text_out 31 "Error" "'./build-aux' cloned failed, you can clone it by yourself or copy it from C++ Plus release source package."
+  text_out 0 "Notice" "try to run 'git clone https://github.com/cppp-project/build-aux'. "
+fi