Update changelog with missing item

Author: Thraka

README.md

@@ -97,6 +97,7 @@ SadConsole uses NuGet for its .NET dependencies:
 - [Core] Added TheDraw font reader: `SadConsole.Readers.TheDrawFont`. **Not a SadConsole Font.**
 - [Core] [Playscii](http://vectorpoem.com/playscii/) support added in the `SadConsoles.Readers` namespace. (RychuP)
 - [Core] Entity renderer has a `RemoveAll` method to clear out all the entities.
+- [Core] Entity renderer now has a `SkipExistsChecks` property which can greatly improve performance when adding/removing entities (when you already have a lot of entities).
 - [Core] For entities, added `AnimatedAppearanceComponent` which can be added to an entity to animate the glyph like the `AnimatedSurface` did for the old entity type.
 - [UI] Fix various minor bugs with controls.
 - [UI] `Textbox` has more events related to text changing.
@@ -109,4 +110,4 @@ SadConsole uses NuGet for its .NET dependencies:
 - [StringParser] String processor no longer hides effects until they're used. All processed strings will set a null effect that will be set on the cells that are printed.
 - [ExtendedLib] Added ClassicConsoleKeyboardHandler and C64KeyboardHandler for cursor handlers.
 - [ExtendedLib] Added MoveViewPortKeyboardHandler component.
-- [ExtendedLib] Added `surface.PrintFadingText` extension method that prints text using the `DrawString` instruction with an effect.
+- [ExtendedLib] Added `surface.PrintFadingText` extension method that prints text using the `DrawString` instruction with an effect.

SadConsole.sln

@@ -28,6 +28,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_Solution Files", "_Solutio
 		.editorconfig = .editorconfig
 		changelog.md = changelog.md
 		MigrationNotes.txt = MigrationNotes.txt
+		README.md = README.md
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ThemeEditor", "Samples\ThemeEditor\ThemeEditor.csproj", "{7A961499-F7E8-4291-A906-AC1CC520EE03}"

changelog.md

@@ -45,6 +45,7 @@
 - [Core] Added TheDraw font reader: `SadConsole.Readers.TheDrawFont`. **Not a SadConsole Font.**
 - [Core] [Playscii](http://vectorpoem.com/playscii/) support added in the `SadConsoles.Readers` namespace. (RychuP)
 - [Core] Entity renderer has a `RemoveAll` method to clear out all the entities.
+- [Core] Entity renderer now has a `SkipExistsChecks` property which can greatly improve performance when adding/removing entities (when you already have a lot of entities).
 - [Core] For entities, added `AnimatedAppearanceComponent` which can be added to an entity to animate the glyph like the `AnimatedSurface` did for the old entity type.
 - [UI] Fix various minor bugs with controls.
 - [UI] `Textbox` has more events related to text changing.