Update to scripts

scripts/User/ReadMe.md

@@ -38,7 +38,21 @@ That's it.
 # iconencode
 Compress an icon asset from an XBM to a compressed char array ready to paste  
 Will assume dimensions of 128x64  
-There is a small header on these I haven't determined the format of, so this won't work as is yet.  
+Header works like this, you'll have to do this manually for now!
+
+Image Header Format Example
+0x01 = Compressed
+0x00 = Reserved Section
+0xa4,0x01 = 0x1a4, or, 420 - the size of the compressed array, minus this header. Just count the commas ;) 
+Rest of the data is char array output from heatshrink of the original XBM char array.
+Calculated Header: 0x01,0x00,0xa4,0x01
+from furi_hal_compress.c:
+typedef struct {
+    uint8_t is_compressed;
+    uint8_t reserved;
+    uint16_t compressed_buff_size;
+} FuriHalCompressHeader;
+
 
 ##  
 # icondecode