Add gitsponsors badge. #581

Job	Run time
intro	1s
check (adafruit_feather_esp32_v2-LED-32x8)	3m 7s
build (adafruit_feather_esp32_v2-LED-32x8)	2m 38s
check (adafruit_matrixportal_s3-HUB75-64x64)	3m 21s
doc	1m 56s
build (adafruit_matrixportal_s3-HUB75-64x64)	3m 10s
test	1m 19s
check (az-delivery-devkit-v4-LED-32x8)	3m 2s
build (az-delivery-devkit-v4-LED-32x8)	2m 17s
check (esp32doit-devkit-v1-LED-32x8)	2m 49s
build (esp32doit-devkit-v1-LED-32x8)	2m 23s
check (esp32doit-devkit-v1-HUB75-64x64)	3m 1s
build (esp32doit-devkit-v1-HUB75-64x64)	2m 8s
check (esp32-s3-devkitc-1-n16r8v-LED-32x8)	3m 20s
build (esp32-s3-devkitc-1-n16r8v-LED-32x8)	3m 11s
check (esp32-s3-devkitc-1-n16r8v-LED-32x16)	3m 14s
build (esp32-s3-devkitc-1-n16r8v-LED-32x16)	2m 58s
check (esp32-nodemcu-LED-32x8)	3m 5s
build (esp32-nodemcu-LED-32x8)	2m 20s
build (lilygo-ttgo-t-display-TFT-32x8)	2m 47s
build (lilygo-t-display-s3-TFT-32x8)	2m 55s
check (lilygo-ttgo-t-display-TFT-32x8)	2m 47s
build (m5stack_core-TFT-32x8)	2m 48s
check (lilygo-t-display-s3-TFT-32x8)	3m 20s
build (ulanzi-tc001-LED-32x8)	2m 26s
check (m5stack_core-TFT-32x8)	2m 48s
build (wemos_lolin_s2_mini-LED-32x8)	2m 38s
check (ulanzi-tc001-LED-32x8)	3m 3s
check (wemos_lolin_s2_mini-LED-32x8)	3m 11s
	1h 18m 3s

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