define basic Partial CST for JSON

QESTIONS.md

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+# tokens in Partial Concrete Syntax
+What sort of tokens should I track in the syntax?
+- delimiters like e.g. in `[a, b, c]`?
+- more significant separators like the `:` in `{ "foo" : a }`?
+- What about groupin symbols like `{ ... }`?
+- What about keywords? e.g. `fn` or `for` or `while`?
+
+Can these questions be answered universally, or is this application dependent?
+- For example, maybe when building a compiler, we don't need to track so much stuff.
+- But for formatter, we probably need to track a bit more.
+- But what about something like a library in a IDE that handles various transformations of the code?
+
+# delimiter confusion
+I just realized that I've been misunderstanding the word `delimiter`.
+I thought that a delimiter was like the `,` in `[ a, b, c]`. But that's called properly called a separator! Or item-separator.
+I thought separator and delimiter where synonyms. But it seems like a `delimiter` is actually the grouping symbols like `[` or `]`.
+