updated README for varbase reorg
updated README for varbase reorg


Former-commit-id: 493ccc5c5439f6f3eb93c5684a9da93df2e33e17
lgbouma/astrobase,waqasbhatti/astrobase,lgbouma/astrobase,lgbouma/astrobase,waqasbhatti/astrobase,waqasbhatti/astrobase