Added comments

.gitignore

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+*.user

DCPlugin.pro

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+TEMPLATE = lib
+CONFIG += plugin PTU5
+#CONFIG += c++11 console
+#CONFIG -= app_bundle
+#QT += widgets
+QT -= gui
+QT += widgets serialport
+
+INCLUDEPATH += $${PWD}/plugins
+INCLUDEPATH += $${PWD}/include
+
+QMAKE_CXXFLAGS += -Wno-deprecated-copy
+
+# default
+ARCH = PTU5
+
+contains( CONFIG, DesktopLinux ) {
+    QMAKE_CC = ccache $$QMAKE_CC
+    QMAKE_CXX = ccache $$QMAKE_CXX
+    QMAKE_CXXFLAGS += -std=c++11
+    linux-clang {  QMAKE_CXXFLAGS += -Qunused-arguments   }
+    ARCH = DesktopLinux
+}
+
+contains( CONFIG, PTU5 ) {
+    QMAKE_CC = ccache $$QMAKE_CC
+    QMAKE_CXX = ccache $$QMAKE_CXX
+    QMAKE_CXXFLAGS += -std=c++11
+    linux-clang {  QMAKE_CXXFLAGS += -Qunused-arguments   }
+    CONFIG += link_pkgconfig
+    ARCH = PTU5
+
+    # NOTE: include contents of DCPlugin.pri. Also used by ATBQT.
+    # Add new files in DCPlugin.pri.
+    include(DCPlugin.pri)
+
+}
+
+contains( CONFIG, PTU5_YOCTO ) {
+    ARCH = PTU5
+
+    # add qmqtt lib
+    #LIBS += -lQt5Qmqtt
+}
+
+TARGET   = CashAgentLib
+DESTDIR  = ../plugins
+
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+
+
+# Default rules for deployment.
+#qnx: target.path = /tmp/$${TARGET}/bin
+#else: unix:!android: target.path = /opt/$${TARGET}/bin
+#!isEmpty(target.path): INSTALLS += target
+