re-add accidentally deleted file

custom_components/llama_conversation/output.gbnf

@@ -0,0 +1,29 @@
+root   ::= (tosay "\n")+ functioncalls?
+
+tosay ::= [0-9a-zA-Z #%.?!]*
+functioncalls ::=
+  "```homeassistant\n" (object ws)* "```"
+
+value  ::= object | array | string | number | ("true" | "false" | "null") ws
+object ::=
+  "{" ws (
+            string ":" ws value
+    ("," ws string ":" ws value)*
+  )? "}" ws
+
+array  ::=
+  "[" ws (
+            value
+    ("," ws value)*
+  )? "]" ws
+
+string ::=
+  "\"" (
+    [^"\\] |
+    "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
+  )* "\"" ws
+
+number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
+
+# Optional space: by convention, applied in this grammar after literal chars when allowed
+ws ::= ([ \t\n] ws)?