add readme

README.md

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+# fedi-frq-friend
+
+just a friend that messages people who send you a follow request
+
+## building
+
+fedi-frq-friend is a typical rust project, therefore:
+```bash
+$ cargo build
+# or to do an optimized build:
+$ cargo build --release
+```
+
+## usage
+
+to run, this program needs two files present in the working directory: config.kdl and fedi-data.toml.
+
+both of these files are created at first run, which looks like this and uses the console for interactive setup.
+
+```
+xenua@secondcoffee ~/projects/fedi-frq-friend (main●)$ cargo run
+    Finished dev [unoptimized + debuginfo] target(s) in 0.08s
+     Running `target/debug/f3`
+created example config.kdl. you probably want to change the text in there
+fedi-data.toml is missing, doing initial setup:
+Enter your instance url (e.g. botsin.space): chaos.social
+Click this link to authorize: https://chaos.social/oauth/authorize?client_id=[redacted]&redirect_uri=urn:ietf:wg:oauth:2.0:oob&scope=read%20write%20follow%20push&response_type=code
+Paste the returned authorization code: [redacted]
+listening for events
+--------------------
+^C
+```
+
+after this, you probably want to edit config.kdl and set a message that makes sense to you
+
+restart the program, and everyone who sends you a follow request will get the message you configured as a pm automatically
+
+## but why?
+
+because follow requests get exhausting, and asking people manually gets annoying