Update README.md

Added hardware requirements.
Add files to linux project
Show GUI with special map in debug mode.
Only assert in shader.cpp in debug mode.
Create automatic switching between render targets
Use render target selection helper functions
Move the simplex noise to comon.glsl.
Implement a screen space reflection
Disable query tests for linux
This more than doubled performance for AMD on Mint16.
Create debian installation
Make the linux distro shell script executable.
Error message when OVR display or HID is missing.
Enable Linux clipboard.
Improved names and comments on the screen space reflection.
Improved debug functionality (for CALIBRATE).
Improved calibration control.
Use argument --calibrate to enable control of UBOcalibrationFactor.
Screen space reflection distance dependence
At longer distances, the random normal is decreased.
Add window width to the uniform buffer
Use mouse wheel for calibration
Implement a small box blur
Allow BM V5 files
They seem to be compatible, at least as long as they are not compressed.
Define new block types for surface effects
Reserve space for 15 of them.