spm: complex refactor, document of package

Tuist/Config.swift

@@ -0,0 +1,11 @@
+import ProjectDescription
+
+let config = Config(
+    compatibleXcodeVersions: [upToNextMajor("14.0")],
+    swiftVersion: "5.4.0",
+    generationOptions:  .options([
+        xcodeProjectName: "SideStore-\(.projectName)",
+        organizationName: "SideStore.io",
+        developmentRegion: "en"
+    ])
+)

Tuist/Setup.swift

@@ -0,0 +1,21 @@
+import ProjectDescription
+
+let setup = Setup(
+    require: [
+        .precondition( 
+            .swiftVersion("5.3.2"), 
+            .xcodeVersion("12.4", "12D4e"))
+    ],
+    run: [
+        .homebrew(packages: [
+            "rustup-init", 
+            "rust", 
+            "cargo-c", 
+            "swiftformat", 
+            "swiftlint", 
+            "swiftgen", 
+            "swift-doc"
+        ]),
+        .mint()
+    ]
+)