Add feature requests github template #1852

Job	Run time
Build on windows-latest for repo global.json	17m 39s
Build on windows-latest for 6.0 stable	18m 53s
Build on windows-latest for 7.0 preview	16m 59s
Build on macos-latest for repo global.json	18m 24s
Build on macos-latest for 6.0 stable	19m 39s
Build on macos-latest for 7.0 preview	19m 14s
Build on ubuntu-latest for repo global.json	14m 3s
Build on ubuntu-latest for 6.0 stable	14m 16s
Build on ubuntu-latest for 7.0 preview	13m 46s
	2h 32m 53s

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