Document different ways to use/bundle

[jpnurmi]

• install normally as a shared/static lib
• include as a submodule
  • include(src.pri)
  • build as a static lib

[jpnurmi]

building as a static lib, part of a project tree:

├── project.pro
├── communi
│   ├── communi (communi submodule)
│   ├── communi.pri (include to projects)
│   ├── communi.pro 
│   └── lib (DESTDIR)
└── app
    ├── app.pro
    └── main.cpp

project.pro:
    TEMPLATE = subdirs
    SUBDIRS += communi app
    CONFIG += ordered

communi/communi.pro:
    CONFIG += static uchardet
    COMMUNI_BUILDDIR = ..
    include(communi/src/src.pro)

communi/communi.pri:
    COMMUNI_BUILDDIR = ..
    DEFINES += COMMUNI_STATIC
    QT += network
    include(communi/communi.pri)

app/app.pro:
    include(../communi/communi.pri)

[jpnurmi]

https://github.com/communi/libcommuni/wiki/Submodule