Add libhv and test http client

vendor/libhv/include/hv/hv.h

@@ -0,0 +1,41 @@
+#ifndef HV_H_
+#define HV_H_
+
+/**
+ * @copyright 2018 HeWei, all rights reserved.
+ */
+
+// platform
+#include "hconfig.h"
+#include "hexport.h"
+#include "hplatform.h"
+
+// c
+#include "hdef.h"   // <stddef.h>
+#include "hatomic.h"// <stdatomic.h>
+#include "herr.h"   // <errno.h>
+#include "htime.h"  // <time.h>
+#include "hmath.h"  // <math.h>
+
+#include "hbase.h"
+#include "hversion.h"
+#include "hsysinfo.h"
+#include "hproc.h"
+#include "hthread.h"
+#include "hmutex.h"
+#include "hsocket.h"
+
+#include "hlog.h"
+#include "hbuf.h"
+
+// cpp
+#ifdef __cplusplus
+#include "hmap.h"       // <map>
+#include "hstring.h"    // <string>
+#include "hfile.h"
+#include "hpath.h"
+#include "hdir.h"
+#include "hurl.h"
+#endif
+
+#endif  // HV_H_