Revert "added install instructions to the README"

This reverts commit aaafacb28217fb4dd029b6d668a4eff943d7c66b.
Revert "Revert "added install instructions to the README""

This reverts commit 41481d993b56c97e6c0c5ffb7e61aeea1b001d99.
Revert "ensure the same instance of AsyncManger is returned each time for a given Activity/Fragment"

This reverts commit 5236c40513b142d64ea1ed6d3c2aab4ca23c3eb4.