fold: add page (#1087)

pages/common/fold.md

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+# fold
+
+> Wraps each line in an input file to fit a specified width and prints it to the standard output.
+
+- Wrap each line to default width (80 characters):
+
+`fold {{file}}`
+
+- Wrap each line to width "30":
+
+`fold -w30 {{file}}`
+
+- Wrap each line to width "5" and break the line at spaces (puts each space separated word in a new line, words with length > 5 are wrapped):
+
+`fold -w5 -s {{file}}`