add libcurl

test/curltest.cpp

@@ -0,0 +1,18 @@
+#include <gtest/gtest.h>
+
+#include <curl/curl.h>
+
+size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) {
+    return size * nmemb;
+}
+
+TEST(curltest, curltest) {
+    if (CURL* curl = curl_easy_init()) {
+        CURLcode res;
+        curl_easy_setopt(curl, CURLOPT_URL, "https://github.com");
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
+        res = curl_easy_perform(curl);
+        std::cout << curl_easy_strerror(res) << std::endl;
+        curl_easy_cleanup(curl);
+    }
+}