添加 'README.md'

README.md

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+
+## qt5
+brew install qt5
+
+.zshrc
+```
+export PATH="/usr/local/opt/qt@5/bin:$PATH"
+export LDFLAGS="-L/usr/local/opt/qt@5/lib"
+export CPPFLAGS="-I/usr/local/opt/qt@5/include"
+```
+
+## plib dist ...
+
+```
+unzip plib-dist.zip
+mv plib-dist install
+```
+
+配置 SimGear 和 FlightGear 时，只需将此 dist 目录用作 CMAKE_INSTALL_PREFIX 即可，无需其他步骤即可找到所有依赖项。
+
+## 编译
+
+```
+
+git clone https://git.kongjian.xin/FGFS-4.0/fgdata.git
+
+
+git clone https://github.com/openscenegraph/OpenSceneGraph.git
+cd OpenSceneGraph
+git checkout OpenSceneGraph-3.6.0
+cd ..
+mkdir osgbuild
+cd osgbuild
+cmake ../OpenSceneGraph/ -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PWD/../install
+make -j8
+make install 
+
+cd ..
+git clone https://git.kongjian.xin/FGFS-4.0/simgear.git
+mkdir sgbuild
+cd sgbuild
+cmake ../simgear -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PWD/../install
+make
+make install
+
+cd ..
+git clone https://git.kongjian.xin/FGFS-4.0/flightgear.git
+
+mkdir fgbuild
+cd fgbuild
+cmake ../flightgear -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$PWD/../install -DFG_DATA_DIR=/Users/zhongjin/FGFS/fgdata
+make
+make install
+
+```
+
+## 运行
+
+open -a ApplicationName
+
+
+.zshrc
+```
+export PATH="/usr/local/opt/qt@5/bin:$PATH"
+
+export LDFLAGS="-L/usr/local/opt/qt@5/lib"
+export CPPFLAGS="-I/usr/local/opt/qt@5/include"
+
+export DYLD_LIBRARY_PATH="~/FGFS/install/lib"
+```