Add HID-BPF tutorial and implementation for virtual mouse input modification

- Introduced a comprehensive tutorial in README.md explaining how to fix broken HID devices using eBPF without kernel patches.
- Implemented a userspace program (hid-input-modifier.c) that creates a virtual HID mouse using the uhid interface and sends synthetic mouse events.
- Developed a BPF program (hid-input-modifier.bpf.c) that intercepts HID events and modifies mouse movement data, effectively doubling the X and Y movement.
- Created necessary header files (hid_bpf.h, hid_bpf_defs.h, hid_bpf_helpers.h) to define structures and helper functions for the BPF program.
- Added functionality to find and manage the virtual HID device, ensuring seamless integration with the BPF program.

src/16-memleak/README.md

@@ -4,6 +4,8 @@ eBPF (extended Berkeley Packet Filter) is a powerful network and performance ana
 
 In this tutorial, we will explore how to write a Memleak program using eBPF to monitor memory leaks in programs.
 
+> The complete source code: <https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/16-memleak>
+
 ## Background and Importance
 
 Memory leaks are a common problem in computer programming and should not be underestimated. When memory leaks occur, programs gradually consume more memory resources without properly releasing them. Over time, this behavior can lead to a gradual depletion of system memory, significantly reducing the overall performance of the program and system.