Prepare app release

Signed-off-by: Markus Birth <markus@birth-online.de>

CHANGELOG.md

@@ -0,0 +1,2 @@
+v0.9:
+Initial Release

README.md

@@ -1,8 +1,29 @@
 Sonicare Brush Head ID
 ======================
 
-NTAG213
-ISO 14443-3 (NFC-A)
+Each modern brush head for a Philips Sonicare contains a Mifare Ultralight NFC chip (NTAG213).
+The chip not only signals to the head unit what type of brush it is (to pre-select the recommended
+mode) but also the recommended lifespan. Usually 6 hours, which resemble 180 brushes (2 minutes
+each), and, assuming 2 brushes per day, this is 90 days = 3 months. The time after which you should
+replace your toothbrush (or the head in this case).
+
+The main unit also writes the time you've used the head back into the NFC chip. If you reach the
+6 hours, the "replace head" indicator will light up.
+
+The NFC chip is write-protected with a password that can be derived from the UID and MFG code. The
+[algorithm for this](https://gist.github.com/atc1441/41af75048e4c22af1f5f0d4c1d94bb56) has been
+reverse-engineered by [atc1441](https://github.com/atc1441).
 
 
-NFC Password algorithm by [atc1441](https://github.com/atc1441): https://gist.github.com/atc1441/41af75048e4c22af1f5f0d4c1d94bb56
+Features
+--------
+
+This Flipper Zero app will scan the NFC chip and show the UID, MFG code, lifespan, as well as
+the used time. It'll also generate the NFC password.
+
+
+TODO
+----
+
+* determine brush head type from [data](https://blog.mbirth.uk/2026/03/29/sonicare-brush-head-nfc-data.html)
+* allow writing back modified data (different type, reset usage)

application.fam

@@ -9,7 +9,7 @@ App(
     fap_category="NFC",
     # Optional values
     requires=["gui"],
-    fap_version="0.1",
+    fap_version="0.9",
     fap_icon="uk_mbirth_sonicare.png",  # 10x10 1-bit PNG
     fap_description="Philips Sonicare brush head reader",
     fap_author="mbirth.uk",