Added guide for Gens custom rank times

hedgedocs/guides/hedgehog-engine/blueblur/levels/custom-ranks.md

@@ -0,0 +1,24 @@
+---
+description: Guide for custom rank times for Sonic Generations
+---
+# How To Specify Custom Ranks for Sonic Generations
+
+!!! info
+    This guide requires the usage of decompiled LUA files, which can be obtained in any console version of the game.
+
+Rank times for all stages are stored in `bb3/#Application.ar.00/ScoreTimeTable.lua`. Opening this file presents you with a list with the A and C rank times (in seconds). The S rank is just the A rank time with a perfect bonus, and the D rank is any time below the C rank time.
+
+## Example
+Let's try editing the times for Seaside Hill (Modern). First we need to locate `ssh200`, as that's the codename for the stage.
+
+```lua
+ScoreTimeTable["ssh200"] = { 220,  820 }
+```
+
+Looking at this, we can see that the A rank for this stage is defined as 220 seconds (3 minutes and 40 seconds), and the C rank is defined as 820 seconds (13 minutes and 40 seconds). So, if we want to change the A rank time to 100 seconds, we can do this:
+
+```lua
+ScoreTimeTable["ssh200"] = { 100,  820 }
+```
+
+After editing the time, we save the file, repack the AR archive, and try it out in-game!

mkdocs.yml

@@ -80,7 +80,8 @@ nav:
         - Level Editing:
           - Sonic GLvl: guides/hedgehog-engine/blueblur/levels/glvl.md
           - Importing Terrain: guides/hedgehog-engine/blueblur/levels/importing-terrain.md
-          - Importing Collision: guides/hedgehog-engine/blueblur/levels/importing-collision.md        
+          - Importing Collision: guides/hedgehog-engine/blueblur/levels/importing-collision.md
+          - Custom Rank Times: guides/hedgehog-engine/blueblur/levels/custom-ranks.md     
           - Troubleshooting: guides/hedgehog-engine/blueblur/levels/troubleshooting.md         
         - File Locations: 
           - Sounds: guides/hedgehog-engine/blueblur/locations/sound.md