✨feat: allow binary exec and improve documentation

- Added new shellcode payloads for exec-argv1 and exec-bin-sh for amd64, i386, and aarch64 architectures.
- Introduced a backup feature for the su binary before overwriting it.
- Enhanced README.md with usage instructions and details about affected kernels.
- Added build-n-print.sh script for building and printing payloads in hex format.

payloads/README.md

@@ -0,0 +1,19 @@
+These are the assembly and binary payloads embedded in copyfail-go
+
+## Scripted
+
+Just run `build-n-print.sh`
+
+## Manual
+
+To build the asm run 
+
+```shell
+nasm -f bin {{ payload }}.asm -o {{ payload }}
+```
+
+To format the binary into the hex for copyfail-go, run 
+
+```shell
+cat {{ payload }} | python3 -c 'import sys, zlib; print(zlib.compress(sys.stdin.buffer.read()).hex())'
+```