Deal with UPM install and move Examples

UnityCipher has dealed with UPM (Unity Package Manager).
Along with this, the Exampes directory has been moved to the ouside packaging.
The installation method using UPM is described below.

UPM Install

// manifest.json
{
  "dependencies": {
       "net.taptappun.taku.kobayashi.unitycipher": "https://github.com/TakuKobayashi/UnityCipher.git?path=/Assets/UnityCipher#v1.3.0"
  }
}

Add Development features.

Merge pull request #2 from TakuKobayashi/develop

version to 1.2.0

Add feature update key settings

v1.1.0

update meta file.

Add LICENSE FIle And UnitTests

v1.0.1

Add Unit Test in RSAEncription

UnityCipher Release!! It can encrypt from Rijndael(AES) or RSA

v1.0

adjust scene