Add compile fuzzer for OSS-Fuzz

tests/jq_fuzz_compile.c

@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "jq.h"
+
+int LLVMFuzzerTestOneInput(uint8_t *data, size_t size) {
+  // Creat null-terminated string
+  char *null_terminated = (char *)malloc(size + 1);
+  memcpy(null_terminated, (char *)data, size);
+  null_terminated[size] = '\0';
+
+  // Fuzzer entrypoint
+  jq_state *jq = NULL;
+  jq = jq_init();
+  if (jq != NULL) {
+    jq_compile(jq, null_terminated);
+  }
+  jq_teardown(&jq);
+
+  // Free the null-terminated string
+  free(null_terminated);
+
+  return 0;
+}