Merge pull request #501 from FoamyGuy/adding_anchored_group

add anchored group,

Author: FoamyGuy

.gitmodules

@@ -1067,3 +1067,6 @@
 [submodule "libraries/drivers/tlv320"]
 	path = libraries/drivers/tlv320
 	url = https://github.com/adafruit/Adafruit_CircuitPython_TLV320.git
+[submodule "libraries/helpers/anchored_group"]
+	path = libraries/helpers/anchored_group
+	url = https://github.com/adafruit/Adafruit_CircuitPython_Anchored_Group.git

docs/drivers.rst

@@ -65,6 +65,8 @@ Helpers for building graphical interfaces using the displayio core module and fr
 
 .. toctree::
 
+    Anchored Group (adafruit_anchored_group) <https://docs.circuitpython.org/projects/anchored_group/en/latest/>
+    Anchored TileGrid (adafruit_anchored_tilegrid) <https://docs.circuitpython.org/projects/anchored_tilegrid/en/latest/>
     Cursor Control (adafruit_cursorcontrol) <https://docs.circuitpython.org/projects/cursorcontrol/en/latest/>
     Bitmap Font (adafruit_bitmap-font) <https://docs.circuitpython.org/projects/bitmap-font/en/latest/>
     Bitmap Saver (adafruit_bitmapsaver) <https://docs.circuitpython.org/projects/bitmapsaver/en/latest/>