Add first modding notes.

Author: goto-bus-stop

README.md

@@ -7,11 +7,15 @@ This is mostly technical stuff!
 ## Notes
 
  - [Installation Notes](./notes/installation.md)
+ - [Modding Notes](./notes/modding.md)
  - [Multiplayer Notes](./notes/multiplayer.md)
  - [Random Map Notes](./notes/random-maps.md)
  - [Recorded Game Notes](./notes/recorded-games.md)
  - [Spectator Notes](./notes/spec.md)
 
+## UserPatch documentation
+The official UserPatch documentation is included as markdown in [up-docs/](./up-docs/).
+
 ## License
 
 [CC0 1.0 Universal](LICENSE.md)

notes/installation.md

@@ -54,3 +54,6 @@ The order of flags is, left to right:
 38. Disable civilian attack switch, for game mods that add custom civilian units. Prevents an issue where they turn into standard villagers in some situations
 39. Handle small farm selections, for mods that have 2x2 farms
 40. Enable research events in chat in spec mode
+
+## Individual patches
+When you hold the Shift key when clicking the install button in the SetupAoC installer, you will be prompted to confirm every single patch that will be applied to the game. This is error prone but allows getting much more specific than the above if necessary.

notes/modding.md

@@ -0,0 +1,22 @@
+# Modding notes
+Interesting bits and bobs for mods: features you can toggle, new things you can do, etc.
+
+See [Installation notes](./installation.md) for the modding related flags in the installer.
+
+## Town Center Pack command
+
+UserPatch 1.4 completely disabled the unused TC Pack command. It can be reenabled by applying a patch to the exe as described [in the referenced post](#source-1).
+
+**References**
+
+1. <a id="source-1" href="https://forums.aiscripters.com/viewtopic.php?f=3&t=2318&p=61658#p61658">https://forums.aiscripters.com/viewtopic.php?f=3&t=2318&p=61658#p61658</a>
+
+   <details>
+   <summary>scripter64 wrote:</summary>
+
+   This update prevents the pack command from packing town centers, which could
+   sometimes improperly happen especially with multiplayer lag. If a mod
+   developer wishes to undo this fix, please change 0x00127125 (file space)
+   to 8B0DA0127900.
+
+   </details>