Update font notes

Author: drojf

assets/fonts/Readme.md

@@ -1,15 +1,43 @@
 # Fonts
 
-msgothic_0 is used for Japanese only and is based off of MS Gothic
+To avoid confusion in this readme:
+- "font asset" will refer to the font asset used in the Unity Sharedassets files.
+- "font file" will refer to what we usually think of as fonts, eg "MS Gothic.ttf" and "PT Sans.ttf"
 
-msgothic_2 is used for English and is based off of PT Sans
+## Differences between Ch.1-9 and Ch.10 (Hou+)
 
-If you're developing a translation into a non-English language like Vietnamese and you find that the font is missing characters needed for your language, try renaming the two `msgothic_2 for non-English` files over the PT Sans ones.  These are based off of Deja-Vu Sans which has support for more languages than PT Sans does.
+There are two different font assets inside the vanilla sharedassets for Chapters 1-9:
+- `msgothic_0`, which is used for Japanese
+- `msgothic_2`, which is used for English
 
-## Hou Plus Notes
+However, chapter 10 only uses one font asset, `msgothic_2`, for both languages.
+
+## Which font files to use when generating assets
+
+We currently keep three fonts in this repository:
+- MS-Gothic.ttf: This is used when generating Japanese font assets (`msgothic_0`, except for Hou+).
+    - Based off MS Gothic
+- PTSans+MS-PGothic.ttf, used for our normal English font assets used in the mod (`msgothic_2`).
+    - This is the 'normal' font used in our mod.
+    - Based off PTSans, but because even in English mode sometimes we need to display Japanese characters, Japanese characters were filled in using MS Gothic.
+- DejaVuSans+MS-PGothic.ttf, used for translations which require special characters like Vietnamese (`msgothic_2`)
+    - Mainly used for translators (as it supports more languages)
+    - Based off DejaVuSans which supports even more non-english characters.
+    - Looks visually different to PTSans
+
+## Supporting more characters
+
+### For Chapters 1-8
 
-Hou Plus uses a single font file (msgothic_2). You will need to use the 'combined' list which contains both 'OtherLang' and Japanese characters.
+If you're developing a translation into a non-English language like Vietnamese and you find that the font is missing characters needed for your language, try renaming the two ``msgothic_2` for non-English` files over the PT Sans ones. These are based off of Deja-Vu Sans which has support for more languages than PT Sans does.
+
+### For Chapters 9 (Rei) and 10 (Hou+)
+
+There may be some alternative fonts in the `assets\files-rei` and `assets\files-hou-plus`, if not contact the mod team to see if they can be added.
+
+## Hou Plus Notes
 
+Hou Plus uses a single font file (`msgothic_2`). You will need to use the 'combined' list which contains both 'OtherLang' and Japanese characters, if you want to generate your own fonts
 
 ## Chinese Font Notes