notes/scriptgroup: add note on error scripts

notes/scriptgroup/31924c653dd3985f36955e591892c7a6f67a79dfddcaf2bb9e8e37c8f9314b0d.md

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+# Error Script
+
+Error Scripts are Bitcoin Scripts that are unspendable due to an error in their construction. While Bitcoin Script is not Turing Complete[^1], it does offer a significant range of functionality over and above the common key-linked address variants such as Pay-2-Public-Key-Hash (P2PKH). This flexibility can lead to errors in script construction that render the script unspendable, such as illogical operations or bad data management.
+
+[^1]: https://en.wikipedia.org/wiki/Turing_completeness