Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/json/docs/examples/operator_ltlt__json_pointer.cpp

@@ -0,0 +1,13 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON poiner
+    json::json_pointer ptr("/foo/bar/baz");
+
+    // write string representation to stream
+    std::cout << ptr << std::endl;
+}