added SHA-1 signing certificate fingerprint

Signed-off-by: Dany Mestas <94061157+DanyPM@users.noreply.github.com>

README.md

@@ -16,6 +16,7 @@ height="80">](https://f-droid.org/packages/com.nextcloud.client/)
 Signing certificate fingerprint to [verify](https://developer.android.com/studio/command-line/apksigner#usage-verify) the APK:
 ```
 SHA-256: fb009522f65e25802261b67b10a45fd70e610031976f40b28a649e152ded0373   
+SHA-1: adc205b0487e68e221cc4b511083aa78ffadc751
 ```
 
 **The Android client for [Nextcloud](https://nextcloud.com). Easily work with your data on your Nextcloud.**