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/17-biopattern/README.md

@@ -4,6 +4,8 @@ eBPF (Extended Berkeley Packet Filter) is a new technology in the Linux kernel t
 
 In this tutorial, we will explore how to use eBPF to write programs to count random and sequential disk I/O. Disk I/O is one of the key metrics of computer performance, especially in data-intensive applications.
 
+> The complete source code: <https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/17-biopattern>
+
 ## Random/Sequential Disk I/O
 
 As technology advances and data volumes explode, disk I/O becomes a critical bottleneck in system performance. The performance of an application depends heavily on how it interacts with the storage tier. Therefore, it becomes especially important to deeply understand and optimise disk I/O, especially random and sequential I/O.