SO link added

Author: FesenkoG

README.md

@@ -1,5 +1,6 @@
 ![bkx-foundation-github-swift](https://user-images.githubusercontent.com/3356474/34412791-5b58962c-ebf0-11e7-8460-5592b12e6e9d.png)
 
+<img align="left" width="25" height="25" src="https://user-images.githubusercontent.com/28599454/41086111-af4bc3b0-6a41-11e8-9f9f-2d642b12666e.png">[Ask questions](https://stackoverflow.com/questions/tagged/web3swift)
 ## Important notices
 With the version 0.3.0 API should be less volatile. All public functions should return a [Result](https://github.com/antitypical/Result) instead of `nil` or throwing.