Update cheatsheets

swift

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# swift
+
+> Create, run and build Swift projects.
+> More information: <https://swift.org>.
+
+- Start a REPL (interactive shell):
+
+`swift`
+
+- Execute a program:
+
+`swift {{file.swift}}`
+
+- Start a new project with the package manager:
+
+`swift package init`
+
+- Generate an Xcode project file:
+
+`swift package generate-xcodeproj`
+
+- Update dependencies:
+
+`swift package update`
+
+- Compile project for release:
+
+`swift build -c release`