Adding tutorial on how to create BMP

examples/LinkCard_demo/#loader/README.md

@@ -4,8 +4,10 @@ This loader scans cards with the **e-Reader** (or in Japan, the **e-Reader+**) a
 
 ## Required tools for compiling
 
+- Windows
 - _devkitARM_ with _GCC 14.1.0_
-- `nevpk.exe`, `neflmake.exe`, `nedcmake.exe`, `nedcenc.exe`, `raw2bmp.exe`
+- `nedcmake.exe`, `nevpk.exe`, `nedcenc.exe`, `raw2bmp.exe`, `neflmake.exe`
+  * Cross-platform versions are available [here](https://github.com/AkBKukU/e-reader-dev) and [here](https://github.com/breadbored/nedclib)
 - _Git Bash_ or some way to run Unix commands like `dd`
 
 ## Compile
@@ -28,4 +30,9 @@ nedcmake -i testcard.txt -o testcard.bin -type 3 -bin -raw -fill 1 -region 1 -na
 # region 2 = JAP
 ```
 
+## Convert cards to BMP for distribution
 
+```bash
+raw2bmp -i testcard.bin-01.raw -o testcard.bin-01
+# generates testcard.bin-01.bmp
+```

examples/LinkCard_demo/#loader/src/protocol.h

@@ -1,16 +1,15 @@
 #ifndef PROTOCOL_H
 #define PROTOCOL_H
 
-#include "def.h"
-
 // This protocol is only meant to be used by homebrew games using
 // gba-link-connection's LinkCard library and its loader. It's highly inspired
-// by `4-e`, but not compatible with it since SMA4 sends the cards from offset
-// `0x72`, and this sends them from offset `0x4E` (no-individual-titles format).
-// That said, you could make it compatible by changing `CARD_OFFSET` and
-// `CARD_SIZE` to the commented values.
+// by `4-e`, but not compatible with it since SMA4 cards start from offset
+// `0x72`, while cards generated with `nedcmake v1.4` start from offset `0x4e`.
+// Both card formats are valid, though. That said, you could make it compatible
+// by changing `CARD_OFFSET` and `CARD_SIZE` to the commented values, or by just
+// recompiling `4-e` to skip 0x4e bytes (no pun intended) instead of 0x72.
 
-#define CARD_OFFSET /*0x72*/ 0x4E
+#define CARD_OFFSET /*0x72*/ 0x4e
 #define CARD_SIZE /*2112*/ 2076
 
 #define HANDSHAKE_1 0xfbfb