chore: add pr template (#24) #44

Job	Run time
check serde	50s
check no-default-features	43s
check std	55s
clippy	1m 26s
docs	1m 20s
test stable --no-default-features	1m 2s
fmt	6s
test stable	51s
test stable --all-features	1m 40s
test beta --no-default-features	2m 40s
test beta	2m 32s
test beta --all-features	2m 47s
test nightly --no-default-features	2m 28s
test nightly	2m 20s
test nightly --all-features	2m 28s
	24m 8s

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