Update README.md

add dimensions

README.md

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 # 八x二　aka "hachi-ni" or "8x2"
 
 八x二 (8x2) is a compact midi controller with 16 potentiometers, 2 buttons, and 8 RGB leds.
-
-MIDI I/O
-* TRS MIDI in, out and thru
-* Auto sensing TRS MIDI Type-A/Type-B input with LPZW Auto Crossover circuit
-* Switch for TRS MIDI Type-A/Type-B output
-* USBMIDI
-
-Power
-* USB-C
-* Lipo Battery (optional)
-
-Hacking
-* RP2040 processor
-* STEMMA-QT connector (i2c)
-* Breakout connections for 3 analog (A0, A1, A2) and 3 digital pins (D4, D11, D12)
+
+MIDI I/O 
+* TRS MIDI in, out and thru 
+* Auto sensing TRS MIDI Type-A/Type-B input with LPZW Auto Crossover circuit 
+* Switch for TRS MIDI Type-A/Type-B output 
+* USBMIDI 
+
+Power 
+* USB-C 
+* Lipo Battery (optional) 
+
+Hacking 
+* RP2040 processor 
+* STEMMA-QT connector (i2c) 
+* Breakout connections for 3 analog (A0, A1, A2) and 3 digital pins (D4, D11, D12) 
+
+Dimensions: 10in x 2.52in (245 x 64 mm) 
 
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 ## How to load firmware