Merge pull request #252 from FoamyGuy/add_displayio_effects

add displayio effects

Author: tannewt

.gitmodules

@@ -484,3 +484,6 @@
 [submodule "libraries/helpers/displayio_annotation"]
 	path = libraries/helpers/displayio_annotation
 	url = https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Annotation.git
+[submodule "libraries/helpers/displayio_effects"]
+	path = libraries/helpers/displayio_effects
+	url = https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Effects.git

circuitpython_community_library_list.md

@@ -127,6 +127,7 @@ Here is a listing of current CircuitPython Community Libraries. These libraries
 * [CircuitPython_Org_DisplayIO_Annotation](https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Annotation.git) Annotation widget for displayio ([PyPi](https://pypi.org/project/circuitpython-displayio-annotation/) \([Docs](https://docs.circuitpython.org/projects/displayio_annotation/en/latest/))
 * [CircuitPython_Org_DisplayIO_Cartesian](https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Cartesian.git) Graph cartesian widget for displayio ([PyPi](https://pypi.org/project/circuitpython-displayio-cartesian/) \([Docs](https://circuitpython-displayio-cartesian.readthedocs.io/en/latest/))
 * [CircuitPython_Org_DisplayIO_Dial](https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Dial.git) Dial widget for displayio ([Docs](https://circuitpython-displayio-dial.readthedocs.io/en/latest/))
+* [CircuitPython_Org_DisplayIO_Effects](https://github.com/circuitpython/CircuitPython_Org_DisplayIO_Effects.git) Displayio effects that manipulate widgets over time ([PyPi](https://pypi.org/project/circuitpython-displayio-effects/) \([Docs](https://circuitpython-displayio-effects.readthedocs.io/en/latest/))
 * [CircuitPython PaletteFader](https://github.com/CedarGroveStudios/CircuitPython_PaletteFader.git) Color palette and list brightness setter and normalizer tool. \([Docs](https://github.com/CedarGroveStudios/CircuitPython_PaletteFader/blob/main/media/pseudo_rtd_cedargrove_palettefader.pdf))
 * [CircuitPython PaletteFilter](https://github.com/CedarGroveStudios/CircuitPython_PaletteFilter.git) Replace color index values in a displayio.Palette object \([Docs](https://github.com/CedarGroveStudios/CircuitPython_PaletteFilter/blob/main/media/pseudo_readthedocs_palettefilter.pdf))
 * [CircuitPython PaletteSlice](https://github.com/CedarGroveStudios/CircuitPython_PaletteSlice.git) Wrap a displayio.Palette object to permit list-like slicing \([Docs](https://github.com/CedarGroveStudios/CircuitPython_PaletteSlice/blob/main/media/pseudo_rtd_paletteslice.pdf))