Follow-up from "Rework README"

The following discussions from !411 (merged) should be addressed:

• @akartasov started a discussion: (+1 comment)

  It would probably be useful to mention the issue template to create a new task

• @akartasov started a discussion: (+1 comment)

  What is supposed to be described here? In what cases can it be useful?

• @akartasov started a discussion: (+1 comment)

  Use Makefile to build binaries from the source