Publish SHA256 fingerprint certificate in the readme

[Spookysafari]

There is no SHA 256 fingerprint signing certificate published on the android apk github repository of ClockMaster, which is essential for verifiying the authenticity of the .apk file, it is necessary for the security of the user and prevent malicious distribution in the name of ClockMaster, it would be really great if the signing keys are added to the readme

I extracted it from my ClockMaster apk installed from github releases, I got this👇

com.pranshulgg.clockmaster
38:83:02:21:DD:2A:8D:07:C8:2A:58:D5:E7:8B:BE:C7:3C:75:5A:56:CB:6F:5F:73:8A:50:11:81:7F:23:B2:9E

Please add it to the readme on github so that obtainium users and users pulling github apks from releases can verify the apk using AppVerifier,Thankyou ❤️