Add basic SwiftPM package manifest#177

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Jeehut wants to merge 3 commits intoRamotion:masterfrom

AccioSupport:master

Commits on Mar 31, 2019

Add basic SwiftPM package manifest
Jeehut
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Commits on Apr 1, 2019

[README] Add 'Accio supported' badge
Jeehut
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Commits on Apr 4, 2019

[README] Document installation via Accio + Remove redundant hint
Jeehut
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