feat: use just for quick tasks.

README.md

@@ -1,2 +1,27 @@
 # libchat
-Supporting library for Logos-chat
+
+Supporting library for Logos-chat.
+
+## Quick Start
+
+Install [just](https://github.com/casey/just) to manage tasks.
+
+On MacOS, you can install it via Homebrew:
+
+```bash
+brew install just
+```
+
+After that, run:
+
+```bash
+# Build
+just build
+
+# Run tests
+just test
+
+# Run all examples
+just run-examples
+```
+

double-ratchets/README.md

@@ -20,8 +20,7 @@ Run examples,
 ```bash
 cargo run --example double_ratchet_basic
 
-cargo run --example storage_demo --features storage
-cargo run --example storage_demo --features sqlcipher
+cargo run --example storage_demo
 ```
 
 Run Nim FFI example,

justfile

@@ -0,0 +1,13 @@
+# The first receipt is default with build
+build:
+  cargo build
+
+test:
+  cargo test
+
+# Run all examples
+run-examples:
+  cargo run --example double_ratchet_basic
+  cargo run --example serialization_demo
+  cargo run --example storage_demo
+  cargo run --example out_of_order_demo