WEEK05-BN: add Binary Ninja lesson for Week 5 (float + double IEEE 754)

New WEEK05-BN.md/.pdf mirroring WEEK04-BN: build/flash/symbol map, load the raw
.bin, dynamic (GDB MI break + live double hack) then static (resolve functions,
patch the 42.5->99.0 one-word and 42.52525->99.99 two-word constants, export,
convert, flash) for both 0x000e float and 0x0011 double. README links it.

README.md

@@ -350,6 +350,8 @@ Integers and Floats in Embedded Systems: Debugging and Hacking Integers and Floa
 
 ### Week 5a Notebook [HERE](https://github.com/mytechnotalent/Embedded-Hacking/blob/main/WEEK05/WEEK05a.md)
 
+### Week 5-BN Notebook [HERE](https://github.com/mytechnotalent/Embedded-Hacking/blob/main/WEEK05/WEEK05-BN.md)
+
 ### Float/Hex Converter Tool [HERE](https://github.com/mytechnotalent/Embedded-Hacking/blob/main/WEEK05/float_hex_converter.py)
 
 ### Chapter 11: Integer Data Type