Add docs/JSON.md from Claro v1.17.26 zip

docs/JSON.md

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+# JSON in Claro
+
+## Parse JSON text
+```claro
+PARSE JSON myText AS value
+```
+
+If JSON is invalid, Claro reports the character offset and a short snippet near the error.
+
+## Make JSON text
+```claro
+MAKE JSON value AS text
+```
+
+### Pretty JSON
+```claro
+MAKE JSON PRETTY value AS text
+```
+
+Pretty output is easier to read for config files and debugging.