Created README file

README.md

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+# signpackage
+Java: Recursively signs certain files, even inside jar files, with "codesign" on macOS.
+
+To notarize Java apps on macOS it is necessary to sign all jar and dylib file in the .app package with the same signature. 
+dylib files can even exist inside jar files and have to be signed inside the jar file, too. This program here performs the
+codesign process. You can use it e.g. like this:
+
+```
+java -jar SignPackage.jar -d appimageoutput -t -r -k "Developer ID Application: John Public (XXXXXXXXXX)" -e "src/main/deploy/package/macosx/MyApp.entitlements"
+```
+
+The parameters are:
+```
+-d The directory that contains the files that have to be codesigned.
+-t Set secure timestamp using the codesign timestamp parameter
+-r Harden using the codesign runtime parameter
+-k Key name
+-e Entitlements file
+```