minor README improvement

README.md

 # nginx-config-tools
 
-Tools for working with `nginx.conf`
+Tools for working with `nginx.conf`.
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+
+## FAQ
+
+ - **why Bash? (Python|Ruby|Rust|OCaml|COBOL|FORTRAN) would have been so much (harder|better|faster|stronger)?**:  
+   Mainly because of compatibility. I expect this tool to be useful in weird server/docker deployments where ability to install dependencies is limited. Bash is available by default in a lot of such environments.
+