add readme

example.config.toml

@@ -0,0 +1,3 @@
+host = "bsky.social"
+pass = ""
+user = ""

readme.md

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+at clietn rust
+
+```sh
+$ mkdir -p ~/.config/atr
+$ cp example.config.toml ~/.config/atr/config.toml
+```
+
+```sh
+# status
+$ cargo build
+$ ./target/debug/atr s
+$ ./target/debug/atr s -u syui.bsky.social
+```
+
+```sh
+# feed
+$ atr f
+$ atr f -u syui.bsky.social
+```
+
+```sh
+# post
+$ ./target/debug/atr p "post message"
+# timeline
+$ ./target/debug/atr t
+
+# media post
+$ ./target/debug/atr m ~/test.png
+```
+
+