Extend README.md

Author: bitkeks

README.md

@@ -6,6 +6,29 @@ It's a Rust-based encryption and decryption tool integrated into the email clien
 
 See: [addons.thunderbird.net/en-GB/thunderbird/addon/arcus/](https://addons.thunderbird.net/en-GB/thunderbird/addon/arcus/)
 
+
+## Thunderbird
+
+What you can do:
+
+* Set your secret key and automatically decrypt emails
+* Generate a new key pair and download it to a file
+* Encrypt plain text in emails for a list of recipients. The addon reads the "To"-field and tries to fetch public keys for these contacts (stored in the "Custom4" field in the address book).
+
+
+### Permissions
+This addon uses a long list of permissions, because each is needed for small things. Of course, nothing unexpected is done with your mails or account!
+
+* compose: Replace plain text with encrypted text
+* storage: Store your own secret key for automatic decryption
+* messagesRead: Read incoming mails and decrypt existing age blocks
+* messagesModify: Replace the cipher text with plaintext (only changed in display, the original email itself is never modified)
+* tabs: Open and query tabs and their content
+* addressBooks: Fetch a public age key from your contact, if stored in field "Custom4"
+* accountsRead: Read info about the current account
+* browserSettings: Compatibility with some functions
+
+
 ## License
 
 Copyright 2023 Dominik Pataky

package-thunderbird.sh

@@ -16,3 +16,6 @@ if [ -f "$TARGET_ZIP" ]; then
 fi
 
 zip -9 -rv $TARGET_ZIP ./
+
+echo
+echo "ZIP $TARGET_ZIP created"