Added Updating TMT tutorial

docs/!general-info.md

@@ -18,6 +18,7 @@ plain number, and perform operations on them by calling functions. e.g, instead
 
 ## Table of Contents:
 
+- [Getting Started](getting-started.md): Getting your own copy of the code set up with Github Desktop.
 - [Basic layer breakdown](basic-layer-breakdown.md): Breaking down the components of a layer with minimal features.
 - [Layer features](layer-features.md): Explanations of all of the different properties that you can give a layer.
 - [Upgrades](upgrades.md): How to create upgrades for a layer.
@@ -28,3 +29,4 @@ plain number, and perform operations on them by calling functions. e.g, instead
 - [Custom Tab Layouts](custom-tab-layouts.md): An optional way to give your tabs a different layout.
                                                    You can even create entirely new components to use.
 - [Subtabs and Microtabs](subtabs-and-microtabs.md): Create subtabs for your tabs, as well as "microtab" components that you can put inside the tabs.
+- [Updating TMT](updating-tmt.md): Using Github Desktop to update your mod's version of TMT.

docs/updating-tmt.md

@@ -0,0 +1,28 @@
+# Updating The Modding Tree
+
+This tutorial assumes that you have used [the Getting Started Tutorial](getting-started.md), and are using Github Desktop and VSCode for your mod.
+
+Here's what you have to do when there's a TMT update:
+
+1. Look at the changelog. It will warn you if the update will break anything or require any changes.
+    Decide if you want to try to update.
+
+2. Open Github Desktop, and at the top middle, click "fetch origin". This will make Github Desktop get
+    information about the update. 
+
+3. Click where it says "current branch: master" at the top middle, and at the bottom of the thing
+that appears, click "choose a branch to merge into master.
+
+4. Select upstream/master. It will likely say there are conflicts, but you have tools to resolve them. 
+    Click "Merge upstream/master into master".
+
+5. A conflict happens when the things you're trying to merge have both made changes in the same place.
+    Click "open in Visual Studio Code" next to the first file. 
+
+6. Scroll down through the file, and look for the parts highlighted in red and green. One of these is
+    your code, and the other is some code that will be modified by the update. Do your best to try to
+    edit things to keep the updated changes, but keep your content.
+
+7. Continue to do this for all remaining challenges.
+
+8. Do any other changes required by the update, run the game, fix issues, etc.