add some info about the Daisy linker and bootloader

docs/03.gen.daisy.md

@@ -80,3 +80,18 @@ This can be done by adding either to the meta.json:
 ```
 
 Do note that the samplerate will be automatically set to either 16k, 32k, 48k, or 96k. Blocksize will need to be 256 or less and is automatically capped.
+
+## Custom Linker script and Bootloader APP_TYPE
+
+Using the Daisy bootloader you can flash the program to other parts of the Daisy memory. Read the ![libDaisy documentation](https://github.com/electro-smith/libDaisy/blob/master/doc/md/_a7_Getting-Started-Daisy-Bootloader.md) for more information.
+
+The linker and `APP_TYPE` can be set in the json metadata accordingly:
+
+```json
+{
+    "daisy": {
+        "linker_script": <path_to_lds_file>,
+        "bootloader": <APP_TYPE>
+    }
+}
+```