docs(contributing): add ViM instructions to setup gnols (#1282) #37

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	13s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	44s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	46s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	42s
test (1.20.x, _test.cmd)	46s
test (1.20.x, _test.pkg)	44s
test (1.20.x, _test.gnolang.native)	20s
test (1.20.x, _test.gnolang.stdlibs)	1m 9s
test (1.20.x, _test.gnolang.realm)	37s
test (1.20.x, _test.gnolang.pkg0)	1m 47s
test (1.20.x, _test.gnolang.pkg1)	9m 21s
test (1.20.x, _test.gnolang.pkg2)	5m 11s
test (1.20.x, _test.gnolang.other)	17s
test (1.21.x, _test.cmd)	1m 59s
test (1.21.x, _test.pkg)	1m 10s
test (1.21.x, _test.gnolang.native)	1m 6s
test (1.21.x, _test.gnolang.stdlibs)	1m 58s
test (1.21.x, _test.gnolang.realm)	1m 14s
test (1.21.x, _test.gnolang.pkg0)	2m 23s
test (1.21.x, _test.gnolang.pkg1)	9m 25s
test (1.21.x, _test.gnolang.pkg2)	5m 52s
test (1.21.x, _test.gnolang.other)	59s
upload-coverage	8s
	48m 51s

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