base32: add page

pages/common/base32.md

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+# base32
+
+> Encode or decode file or standard input, to standard output.
+
+- Encode a file:
+
+`base32 {{filename}}`
+
+- Decode a file:
+
+`base32 -d {{filename}}`
+
+- Encode from stdin:
+
+`{{somecommand}} | base32`
+
+- Decode from stdin:
+
+`{{somecommand}} | base32 -d`