[A]Add sdk version

[B]Fix bug in README file

sdk_core/include/livox_sdk.h

@@ -33,6 +33,12 @@ extern "C" {
 #include <stdint.h>
 #include "livox_def.h"
 
+/**
+* Return SDK's version information in a numeric form.
+* @param version Pointer to a version structure for returning the version information.
+*/
+void GetLivoxSdkVersion(LivoxSdkVersion *version);
+
 /**
  * Initialize the SDK.
  * @return true if successfully initialized, otherwise false.