[#26] Added information about git lfs in the README.md

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

README.md

 # VkCV Framework
  A Vulkan framework for computer visualistics simplifying building applications
 
+## Repository
+
+Git LFS is used for bigger resource files like meshes and textures. So you need to install Git LFS and use `git lfs install` after cloning.
+
+More information about Git LFS [here](https://git-lfs.github.com/).
+
 ## Build
 
 Git submodules are used for libraries.