Add screenshot to README.md

Author: aw

README.md

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 A simple set of shell scripts for managing networking on [TinyCore Linux](http://tinycorelinux.net/)
 
+![tinycore-network](https://user-images.githubusercontent.com/153401/33258367-3b969774-d351-11e7-90e2-071b039473c9.png)
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 # Installation
 
 `tce-load -wi network`