Add installation instructions #775

Job	Run time
Documentation	2m 3s
Julia 1.0 - ubuntu-latest - x64 - pull_request	6m 20s
Julia 1.0 - ubuntu-latest - x86 - pull_request	7m 3s
Julia 1.0 - macOS-latest - x64 - pull_request	7m 42s
Julia 1.0 - windows-latest - x64 - pull_request	8m 22s
Julia 1.0 - windows-latest - x86 - pull_request	11m 26s
Julia 1 - ubuntu-latest - x64 - pull_request	6m 2s
Julia 1 - ubuntu-latest - x86 - pull_request	4m 57s
Julia 1 - macOS-latest - x64 - pull_request	7m 56s
Julia 1 - windows-latest - x64 - pull_request	7m 5s
Julia 1 - windows-latest - x86 - pull_request	7m 49s
Julia nightly - ubuntu-latest - x64 - pull_request	3m 6s
Julia nightly - ubuntu-latest - x86 - pull_request	3m 30s
Julia nightly - macOS-latest - x64 - pull_request	4m 14s
Julia nightly - windows-latest - x64 - pull_request	4m 26s
Julia nightly - windows-latest - x86 - pull_request	4m 30s
	1h 36m 31s

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