Remove qtgraphicaleffects sources and add note about its state in Qt 6HEADdev

Add a README.md mentioning the documentation on where the ported
effects can be found, as well as how to check out the Qt5 branch.

Pick-to: 6.2
Fixes: QTBUG-95757
Change-Id: Ib47c7e73f8622c8e287df0f74c6f16a5113b357e
Reviewed-by: Tor Arne Vestbø <[email protected]>
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 0 insertions, 8 deletions

diff --git a/tests/manual/smooth/SourceImage.qml b/tests/manual/smooth/SourceImage.qml
deleted file mode 100644
index 86cf269..0000000
--- a/tests/manual/smooth/SourceImage.qml
+++ /dev/null
@@ -1,8 +0,0 @@
-import QtQuick 2.12
-
-Image {
-    source: "star.png"
-    smooth: false
-    scale: 4
-    transformOrigin: Item.TopLeft
-}