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Update README.md

Adding link to new setup of the working environment
unstable testcase in ProjectUpAndDownload fixed.
unstable testcase in MainMenuActivity fixed.
Merge pull request #1011 from Catrobat/cat-1049

testcase ProjectUpAndDownloadTest.testUploadStandardProject fixed
Merge pull request #1007 from Catrobat/cat-943

CAT-943
notification icon changed to black/white
Refactor handleAction* methods
fix broadcast issue

added precomputation
refactor broadcast bricks
replace object with string matching
smarter precomputation
added regression tests