Add libhv and test http client

vendor/libhv/include/hv/ifconfig.h

@@ -0,0 +1,36 @@
+#ifndef HV_IFCONFIG_H_
+#define HV_IFCONFIG_H_
+
+#include <vector>
+
+#include "hexport.h"
+
+#ifdef _MSC_VER
+#pragma comment(lib, "iphlpapi.lib")
+#pragma comment(lib, "ws2_32.lib")
+#endif
+
+typedef struct ifconfig_s {
+    char name[128];
+    char ip[16];
+    char mask[16];
+    char broadcast[16];
+    char mac[20];
+} ifconfig_t;
+
+/*
+ *  @test
+    std::vector<ifconfig_t> ifcs;
+    ifconfig(ifcs);
+    for (auto& item : ifcs) {
+        printf("%s\nip: %s\nmask: %s\nbroadcast: %s\nmac: %s\n\n",
+                item.name,
+                item.ip,
+                item.mask,
+                item.broadcast,
+                item.mac);
+    }
+ */
+HV_EXPORT int ifconfig(std::vector<ifconfig_t>& ifcs);
+
+#endif // HV_IFCONFIG_H_