Start to move docs to Swift Package Index

Author: scottmatthewman

.spi.yml

@@ -0,0 +1,4 @@
+version: 1
+builder:
+  configs:
+    - documentation_targets: [SwiftCSVEncoder]

Package.resolved

@@ -15,10 +15,6 @@ let package = Package(
             name: "SwiftCSVEncoder",
             targets: ["SwiftCSVEncoder"]),
     ],
-    dependencies: [
-        // Used only for building the package documentation
-        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.1.0")
-    ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
         // Targets can depend on other targets in this package and products from dependencies.

Package.swift

@@ -2,7 +2,7 @@
 
 A Swift package that allows for creation of CSV files.
 
-[**Read the full documentation.**](https://scottmatthewman.github.io/swiftcsvencoder/documentation/swiftcsvencoder/)
+[![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fscottmatthewman%2Fswiftcsvencoder%2Fbadge%3Ftype%3Dswift-versions)](https://swiftpackageindex.com/scottmatthewman/swiftcsvencoder) [![](https://img.shields.io/endpoint?url=https%3A%2F%2Fswiftpackageindex.com%2Fapi%2Fpackages%2Fscottmatthewman%2Fswiftcsvencoder%2Fbadge%3Ftype%3Dplatforms)](https://swiftpackageindex.com/scottmatthewman/swiftcsvencoder)
 
 ## Rationale