Add deltachat-core-rust to the build

Cargo.toml

@@ -3,9 +3,11 @@ name = "telepathy-padfoot"
 version = "0.1.0"
 authors = ["Nick Thomas <me@ur.gs>"]
 edition = "2018"
+license = "MIT"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 anyhow = "1.0"
 dbus = "0.8.2"
+deltachat = { git = "https://github.com/deltachat/deltachat-core-rust", tag="1.31.0" }

README.md

@@ -14,6 +14,30 @@ Telepathy clients to send/receive Delta messages.
 Telepathy CMs should have a name that is not the same as their protocol; so this
 CM is hereby named "padfoot".
 
+My first attempt was [purple-plugin-delta](https://code.ur.gs/lupine/purple-plugin-delta). This has some licensing issues (linking libpurple with OpenSSL)
+that will be resolved with OpenSSL v3.0.0. At least until then, I've lost
+interest in it; my efforts are going into this version instead.
+
+## When
+
+When it's ready.
+
+## Where
+
+Here's where we're at right now:
+
+- [x] Connect to DBUS
+- [x] Advertise enough properties / interfaces to become visible in Empathy
+- [~] Connect to deltachat-core-rust
+- [ ] Set up an account via autoconfiguration
+- [ ] Set up an account manually
+- [ ] Text messages
+- [ ] Multimedia messages
+- [ ] Setup messages
+- [ ] Import/Export
+- [ ] Group chats
+- [ ] Geolocation messages
+
 ## Why
 
 Mobile IM, mostly. Desktop IM, also. It's ideal for my pinephone, and lighter
@@ -21,8 +45,9 @@ than the electron desktop client.
 
 ## How
 
-This project is written in Rust, just like the main Delta library, so you'll
+This project is written in Rust, so you'll need a rust compiler to build it.
-need a rust compiler to build it.
+[Rustup]() comes highly recommended. Deltachat is also written in Rust and it
+needs the `nightly` version, so follow the instructions for that.
 
 It makes use of the `dbus-codegen-rust` crate to convert the
 [telepathy interface specs](https://github.com/TelepathyIM/telepathy-spec) into