Added editor config file (#6)

* ADD: added .editorconfig file to force uniform editor settings

* FIX: .editor config to use spaces of width 4 instead of tab

Updated to use space because it is already using space of width 4 instead of tab so some error occured while using indent_style=tab and using tab for indentaion. error: ```Inconsistent use of tabs and spaces in indentation```

Author: sebakthapa

.editorconfig

@@ -0,0 +1,4 @@
+[*]
+indent_style = space
+tab_width = 4
+indent_size = 4