add sign in with LINE example

Author: demolaf

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/App/ContentView.swift

@@ -56,6 +56,15 @@ struct ContentView: View {
     .withOAuthSignIn(OAuthProviderSwift.github())
     .withOAuthSignIn(OAuthProviderSwift.microsoft())
     .withOAuthSignIn(OAuthProviderSwift.yahoo())
+    .withOAuthSignIn(
+      OAuthProviderSwift(
+        providerId: "oidc.line",
+        displayName: "Sign in with LINE",
+        buttonIcon: Image(.icLineLogo),
+        buttonBackgroundColor: .lineButton,
+        buttonForegroundColor: .white
+      )
+    )
     .withEmailSignIn()
   }
 

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/Assets.xcassets/ic-line-logo.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "fui-ic-line-logo.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "fui-ic-line-logo-x2.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "fui-ic-line-logo-x3.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/Assets.xcassets/ic-line-logo.imageset/fui-ic-line-logo-x2.png

@@ -0,0 +1,38 @@
+{
+  "colors" : [
+    {
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0x55",
+          "green" : "0xC7",
+          "red" : "0x06"
+        }
+      },
+      "idiom" : "universal"
+    },
+    {
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "alpha" : "1.000",
+          "blue" : "0x55",
+          "green" : "0xC7",
+          "red" : "0x06"
+        }
+      },
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}