Add a 3.0 migration guide (TextureGroup#1875)

garrettmoon · web-flow · commit 6a3a24707eae · 2020-06-25T15:57:11.000-07:00
diff --git a/ThreeMigrationGuide.md b/ThreeMigrationGuide.md
@@ -0,0 +1,3 @@
+### Texture 3.0 Migration Guide ###
+
+Got a tip for upgrading? Please open a PR to this document!

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+### Texture 3.0 Migration Guide ###`
	`2`	`+`
	`3`	`+Got a tip for upgrading? Please open a PR to this document!`