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

docs/ERRORS.md

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+# Claro Errors
+
+Claro tries to report mistakes in beginner-friendly language.
+
+Examples:
+
+```text
+I do not know the command "PRNT". Did you mean "SAY"?
+```
+
+```text
+SET needs TO.
+Try:
+SET name TO "Alex"
+```
+
+```text
+IF block opened here is missing ENDIF
+```
+
+```text
+I do not know the variable "socre" yet. Did you mean "score"?
+```
+
+For safer learning, run this before running a new program:
+
+```bash
+./claro check my_program.claro
+```