add support for cut command

pages/common/cut.md

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+# cut
+
+> Cut out fields from STDIN
+
+- Cut out the first sixteen characters of each line of STDIN
+
+`cut -c 1-16`
+
+- Cut out the fifth field, split on the colon character of each line in `file`
+
+`cut -d':' -f5 file`
+
+- Cut out the fields five and 10, split on the colon character of each line in `file`
+
+`cut -d':' -f5,10 file`
+
+- Cut out the fields five through 10, split on the colon character of each line in `file`
+
+`cut -d':' -f5-10 file`
+
+  Cut out everything from the 3rd character to the end of each line
+
+`cut -c3- test.txt`