added README

README.md

@@ -0,0 +1,31 @@
+# backup-dc-from-db-cli
+
+This is a small CLI tool to open a DeltaChat directory
+and export it in the format
+which can be imported by any Delta Chat client.
+
+## Setup
+
+```
+git clone https://git.0x90.space/missytake/backup_dc_from_db_cli
+cd backup_dc_from_db_cli
+poetry install
+```
+
+## Usage
+
+```
+$ poetry run backup-dc-from-db-cli -h
+usage: backup-dc-from-db-cli [-h] [--db_path DB_PATH] [--account ACCOUNT] [--output OUTPUT] [--passphrase PASSPHRASE] [-v]
+
+options:
+  -h, --help            show this help message and exit
+  --db_path DB_PATH     Path to DeltaChat directory
+  --account ACCOUNT     email address of the account to backup
+  --output OUTPUT       output file name
+  --passphrase PASSPHRASE
+                        passphrase to encrypt the backup file. environment variable: DC_BACKUP_PASSPHRASE
+  -v, --verbose         print logs
+$ poetry run backup-dc-from-db-cli --account user@example.org --output ~/Desktop/backup.tar
+```
+