Add info about configuration of NLog.Web in web.config to README.md

[muromek]

No description provided.

[codecov-io]

Current coverage is 9.58%

Merging #25 into master will not affect coverage as of 8e5c4f9

@@            master    #25   diff @@
=====================================
  Files           12     12       
  Stmts          146    146       
  Branches        34     34       
  Methods          0      0       
=====================================
  Hit             14     14       
  Partial          2      2       
  Missed         130    130       

Review entire Coverage Diff as of 8e5c4f9

---

Uncovered Suggestions

1. +4.11% via ...ringTargetWrapper.cs#194...199
2. +3.43% via ...ringTargetWrapper.cs#166...170
3. +3.43% via ...ringTargetWrapper.cs#88...92
4. See 7 more...

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[304NotModified]

Thanks!