document pod use in nqp

docs/using-pod-in-nqp.md

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+## Using POD in NQP
+
+Limited pod use is acceptable in nqp files.  The following forms are currently allowed:
+
+### Single-line entries
+
+    =identifier ...text...  # note that use of 'cut' as an identifier will cause a panic
+
+Any word (other than 'cut' is accepted). The entry may be used inside a pod block.
+
+### Blocks
+
+    =begin ...optional identifier... ...optional text...
+    ...any text
+    =end ...optional identifier...
+
+If the **=begin** has an identifier, the **=end** should have the same identifier (not
+yet enforced).
+
+
+