docs: add quick intro to repl tool

README.md

@@ -23,3 +23,117 @@ $ cargo test --all
 [circle]: https://circleci.com/gh/deltachat/deltachat-core-rust/
 [appveyor-shield]: https://ci.appveyor.com/api/projects/status/lqpegel3ld4ipxj8/branch/master?style=flat-square
 [appveyor]: https://ci.appveyor.com/project/dignifiedquire/deltachat-core-rust/branch/master
+
+## Using the CLI client
+
+Run using `cargo`:
+
+```
+cargo run --example repl -- /path/to/db
+```
+
+Configure your account (if not already configured):
+
+```
+Delta Chat Core is awaiting your commands.
+> set addr your@email.org
+> set mail_pw yourpassword
+> configure
+```
+
+If you're already configured it's enough to `> connect`.
+
+Create a contact:
+
+```
+> addcontact yourfriends@email.org
+Command executed successfully.
+```
+
+List contacts:
+
+```
+> listcontacts
+Contact#10: <name unset> <yourfriends@email.org>
+Contact#1: Me √√ <your@email.org>
+```
+
+Create a chat with your friend and send a message:
+
+```
+> createchat 10
+Single#10 created successfully.
+> chat 10
+Single#10: yourfriends@email.org [yourfriends@email.org]
+> send hi
+Message sent.
+```
+
+For more commands type `> help`:
+
+```
+> help
+==========================Database commands==
+info
+open <file to open or create>
+close
+set <configuration-key> [<value>]
+get <configuration-key>
+oauth2
+configure
+connect
+disconnect
+maybenetwork
+housekeeping
+help imex (Import/Export)
+==============================Chat commands==
+listchats [<query>]
+listarchived
+chat [<chat-id>|0]
+createchat <contact-id>
+createchatbymsg <msg-id>
+creategroup <name>
+createverified <name>
+addmember <contact-id>
+removemember <contact-id>
+groupname <name>
+groupimage [<file>]
+chatinfo
+sendlocations <seconds>
+setlocation <lat> <lng>
+dellocations
+getlocations [<contact-id>]
+send <text>
+sendimage <file> [<text>]
+sendfile <file>
+draft [<text>]
+listmedia
+archive <chat-id>
+unarchive <chat-id>
+delchat <chat-id>
+===========================Message commands==
+listmsgs <query>
+msginfo <msg-id>
+listfresh
+forward <msg-id> <chat-id>
+markseen <msg-id>
+star <msg-id>
+unstar <msg-id>
+delmsg <msg-id>
+===========================Contact commands==
+listcontacts [<query>]
+listverified [<query>]
+addcontact [<name>] <addr>
+contactinfo <contact-id>
+delcontact <contact-id>
+cleanupcontacts
+======================================Misc.==
+getqr [<chat-id>]
+getbadqr
+checkqr <qr-content>
+event <event-id to test>
+fileinfo <file>
+clear -- clear screen
+exit
+=============================================
+```