Make readme better

[nezed]

• Collapse beginning and separate detailed "Synopsis" into "Examples". Still informative for a new user, but more convenient for those already familiar.
• Extract a lot of functions usage examples into "Examples" section.
• Improve references over document.
• Options now presented as a table.
• Replace mentions of nonexistent inputFormat with format option and FORMAT statement.
• Hide dangerous for end-user option omitFormat. (Format detection works pretty good as for me.) Also looks like FORMAT statement useful for any kind of query.
• Hide useless and confusing syncParser option. Provide reference and examples of promise interface instead.
• Refactor code snippets to use standard JS codestyle and ES6+ syntax, for make it easier to read.

https://github.com/apla/node-clickhouse/blob/make-readme-better/README.md

[codecov-io]

Codecov Report

Merging #41 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   88.65%   88.65%           
=======================================
  Files           6        6           
  Lines         326      326           
=======================================
  Hits          289      289           
  Misses         37       37

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