Update 'README.md'

README.md

@@ -1,3 +1,10 @@
-# usefull-oneliners
+# Usefull Oneliners
 
-Usefull Oneliners
+## vim
+
+* Set tab to 4 spaces: `set tabstop=8 softtabstop=0 expandtab shiftwidth=4 smarttab`
+
+
+References
+------
+* https://stackoverflow.com/questions/1878974/redefine-tab-as-4-spaces