Add more info aboud dependencies in README.md

[TheGetHuber]

No information about what dependencies i need to install.
cmake arguing about compiling process and giving an error like:

CMake Error at CMakeLists.txt:21 (find_package):
  By not providing "FindKF5Plasma.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "KF5Plasma", but CMake did not find one.

  Could not find a package configuration file provided by "KF5Plasma"
  (requested version 5.0) with any of the following names:

    KF5PlasmaConfig.cmake
    kf5plasma-config.cmake

  Add the installation prefix of "KF5Plasma" to CMAKE_PREFIX_PATH or set
  "KF5Plasma_DIR" to a directory containing one of the above files.  If
  "KF5Plasma" provides a separate development package or SDK, be sure it has
  been installed.

Installed everything it wanted, still arguing about lack of KF5Plasma...

[tobolikd]

You have to install devel version of every needed package. For me on fedora it was running sudo dnf install kf5-plasma-devel, try to find this package for you package manager.

But I agree there could be more information about required packages.

On fedora you need to install
sudo dnf install qt5-qtbase-devel qt5-qtdeclarative-devel kf5-plasma-devel pulseaudio pulseaudio-libs-devel