Add eww/yuck/README.md

eww/yuck/README.md

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+# Yuck files  
+
+Yuck is the custom language to config EWW  
+Refer the [official docs](https://elkowar.github.io/eww/configuration.html) for basic config instructions.  
+
+## Splitting Eww Config  
+There are 2 ways to specify path while including other `.yuck` files:  
+Absolute path:  
+
+    (include "/absolute/path/from/root/to/file.yuck")
+Relative path(relative to eww config dir):  
+
+    (include "path/relative_to/eww_config_dir/file.yuck")