Add CMake project and package

README.md

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+# FairLogger
+
+Lightweight C++ Logging Library
+
+## Installation
+
+```bash
+git clone https://github.com/FairRootGroup/FairLogger
+mkdir FairLogger_build && cd FairLogger_build
+cmake -DCMAKE_INSTALL_PREFIX=./FairLogger_install ../FairLogger
+cmake --build . --target install
+```
+
+## Usage
+
+In your `CMakeLists.txt`:
+
+```cmake
+find_package(FairLogger)
+```
+
+If FairLogger is not installed in system directories, you can hint the installation location:
+
+```cmake
+set(CMAKE_PREFIX_PATH /path/to/FairLogger/installation ${CMAKE_PREFIX_PATH})
+find_package(FairLogger)
+```
+
+`find_package(FairLogger)` will define an imported target `FairLogger::FairLogger`.
+
+## CMake options
+
+On command line:
+
+  * `-DDISABLE_COLOR=ON` disables coloured console output.
+
+## License
+
+GNU Lesser General Public Licence (LGPL) version 3, see [LICENSE](LICENSE).
+
+Copyright (C) 2017-2018 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH