[TYPO3-core] RFC #9745: Add INSTALL.txt to TYPO3 source package

[Christopher]

Hi again!

Something else:
I am now in the part on symlinks: ;-)

These lines are only valid for Linux et al:
"Next create links for the typo3/ and t3lib/ directories:
           cd /var/www/example.com
           ln -s typo3_src/t3lib
           ln -s typo3_src/typo3"

Somehow the document is not structured very well.
Maybe this is the reason that for Windows users a detailed explanation is 
forgotten.

I think it is easier, if YOU add it. ;-)

Christopher