Add PineTimeStyle watchface (#334)

* PineTimeStyle
* Move GPL license header
* Add step count gauge - replaces heartrate in sidebar
* Enable 12/24h functionality
* Set step gauge outer to be white when step goal is reached
* Add font source file
* Move static needle_colors array to member variable
* Add documentation on generating a font
* Replace .ttf with Google version, add link to font page

Co-authored-by: JF002 <JF002@users.noreply.github.com>

src/displayapp/fonts/README.md

@@ -2,6 +2,7 @@
 
 * [Jetbrains Mono](https://www.jetbrains.com/fr-fr/lp/mono/)
 * [Awesome font from LVGL](https://lvgl.io/assets/others/FontAwesome5-Solid+Brands+Regular.woff)
+* [Open Sans Light from Google](https://fonts.google.com/specimen/Open+Sans)
 
 ## Generate the fonts:
 
@@ -14,6 +15,8 @@
 * Add a 2nd font, load the file `FontAwesome5-Solid+Brands+Regular.woff` and specify the following
   range : `0xf293, 0xf294, 0xf244, 0xf240, 0xf242, 0xf243, 0xf241, 0xf54b, 0xf21e, 0xf1e6, 0xf54b, 0xf017, 0xf129, 0xf03a, 0xf185, 0xf560, 0xf001, 0xf3fd, 0xf069, 0xf1fc, 0xf45d, 0xf59f, 0xf5a0, 0xf029, 0xf027, 0xf028, 0xf6a9, 0xf04b, 0xf04c, 0xf048, 0xf051, 0xf095, 0xf3dd, 0xf04d, 0xf2f2, 0xf024, 0xf252`
 * Click on Convert, and download the file `jetbrains_mono_bold_20.c` and copy it in `src/DisplayApp/Fonts`
+* Add the font .c file path to src/CMakeLists.txt
+* Add an LV_FONT_DECLARE line in src/libs/lv_conf.h
 
 Add new symbols:
 
@@ -28,6 +31,21 @@ Add new symbols:
 static constexpr const char* newSymbol = "\xEF\x86\x85";
 ```
 
+## Simple method to generate a font
+
+If you want to generate a basic font containing only numbers and letters, you can use the above settings but instead of specifying a range, simply list the characters you need in the Symbols field and leave the range blank. This is the approach used for the PineTimeStyle watchface.
+This works well for fonts which will only be used to display numbers, but will fail if you try to add a colon or other punctuation.
+
+* Open the [LVGL font converter](https://lvgl.io/tools/fontconverter)
+* Name : open_sans_light
+* Size : 150
+* Bpp : 1 bit-per-pixel
+* Do not enable font compression and horizontal subpixel hinting
+* Load the file `open_sans_light.tff` (use the file in this repo to ensure the version matches) and specify the following symbols : `0123456789`
+* Click on Convert, and download the file `open_sans_light.c` and copy it in `src/DisplayApp/Fonts`
+* Add the font .c file path to src/CMakeLists.txt (search for jetbrains to find the appropriate location/format)
+* Add an LV_FONT_DECLARE line in src/libs/lv_conf.h (as above)
+
 #### Navigation font
 
 To create the navigtion.ttf I use the web app [icomoon](https://icomoon.io/app)