Added support for the Swift Package Manager.

Also:
* Added support for h1-h6 tags;
* Updated README.md file;
* Added the application icon.

Author: iaenhaall

.gitignore

@@ -1,9 +1,19 @@
 # macOS
 #
-# temporary files that should never be committed
+# temporary files that should not be committed
 
 .DS_Store
 
+# Project
+#
+# project files that should not be committed
+
+
+
+
+# GitHub's .gitignore file content
+#######################################################
+
 # Xcode
 #
 # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
@@ -43,10 +53,11 @@ playground.xcworkspace
 # Swift Package Manager
 #
 # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
-# Packages/
+/Packages
 # Package.pins
 # Package.resolved
-# *.xcodeproj
+/*.xcodeproj
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 #
 # Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
 # hence it is not needed unless you have added a package configuration file to your project