Added DefaultParser

docs/syntax_v3.md

@@ -0,0 +1,17 @@
+```
+> "hello
+-> unfinished quote "
+> def concept unfinished quote q
+... where:
+...... q in ('"', '"')
+... desc:
+...... "Error detected by the default parser where the trailing quote is missing"
+... input = sheerka.last_input
+
+
+> when unfinished quote q as c:
+... add rule as:
+...... if q in sheerka.input:
+......... sheerka.resume(c, c.input + input)
+......... remove rule 
+```