Encryption Example (#1)

* 00: add readme

Signed-off-by: Denis Dobanda <denis.dobanda@exxeta.com>

* 00: add initial keystore example

Signed-off-by: Denis Dobanda <denis.dobanda@exxeta.com>

* 00: implement crypto toolbox

Signed-off-by: Denis Dobanda <denis.dobanda@exxeta.com>

---------

Signed-off-by: Denis Dobanda <denis.dobanda@exxeta.com>
Co-authored-by: Denis Dobanda <denis.dobanda@exxeta.com>

Author: theDeniZ

Keystore-Example/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

Keystore-Example/REAMDE.md

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+# Example of encryption using Keystore
+
+## Description
+
+This project shows an example of how to use the Android Keystore to encrypt and
+decrypt String values.
+
+See full example
+in [CryptoToolboxImpl](./app/src/main/java/com/exxeta/keystoreexample/CryptoToolboxImpl.kt)
+class
+
+## How to use the project
+
+The project was tested on Android 14. Use latest Android Studio version
+
+## Structure of the project
+
+### `CryptoToolbox`
+
+Interface for a CryptoToolbox
+
+### `CryptoToolboxImpl`
+
+Implementation of CryptoToolbox. Use it as it seems fit
+
+### `EncryptionException`
+
+An exception class to use in CryptoToolbox