Big update!

- Source code added
- Readme, gitignore, banner and the license are updated

.gitignore

@@ -1,4 +1,30 @@
 /target
-/.vscode
-/tests
 Cargo.lock
+
+# This part is taken from GitHub's macOS gitignore template
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk