Add Godot scripting starting notes

DotNet/C#/Async Programming.md

@@ -160,4 +160,4 @@ protected async void MyButton_Click(object sender, EventArgs e)
   // We may actually be on another *thread*, but we have the same ASP.NET request context.
   Response.Write("File downloaded!");
 }
-```
+```

DotNet/C#/C#.md

@@ -2907,4 +2907,4 @@ In this case, the method must also be declared as `static`.
 ```cs
 [DllImport("avifil32.dll")]
 private static extern void AVIFileInit();
-```
+```

DotNet/C#/Reactive Extensions.md

@@ -12,7 +12,7 @@ of an Rx source demand to be given the next item. Instead, Rx uses a *push* mode
 
 Because Rx implements standard LINQ operators, it's possible to write queries against a live source. Rx goes beyond standard LINQ, adding its own operators that take into account the temporal nature of a live event source.
 
-## Foundamental Interfaces
+## Fundamental Interfaces
 
 The two most important types in Rx are the `IObservable<T>` and `IObserver<T>` interfaces.  
 They are important enough to be in the System namespace. The other parts of Rx are in the `System.Reactive` NuGet package.