update README

Author: smallnest

README.md

@@ -1,30 +1,65 @@
 # concurrency programming via rust
 
+![](book/images/gear.png)
 
-## chapter 1: Thread
+## How to run?
 
-## chapter 2: Thread Pool
+Enter one crate such as thread and run `cargo run`.
 
-## chapter 3: async/.await
+## Contents
 
-## chapter 4: synchronization primitives
+I have a plan to write a book about conncurrency programming via rust. The below is the contents of it and this repo contains all source codes.
 
-## chapter 5: concurrency collections
+### chapter 1: Thread
 
-## chapter 6: process
+Introduces [Threads](thread/src/main.rs) in std and concurrency libs.
 
-## chapter 7: channel
 
-## chapter 8: timer/ticker
+### chapter 2: Thread Pool
 
-## chapter 9: parking_lot
+Introduces [Thread pool](pool/src/main.rs) for std thread.
 
-## chapter 10: crossbeam
+### chapter 3: async/await
 
-## chapter 11: rayon
+Introduces [async feature](asyncwait/src/main.rs).
 
-## chapter 12: tokio
+### chapter 4: synchronization primitives
 
-## chapter n: special
+Introduces synchronization primitives contains [containers](container_primitive/src/main.rs) and [primitives](sync_primitive/src/main.rs) in std lib.
+
+### chapter 5: concurrency collections
+
+Introduces [concurrency collections](collections/src/main.rs) in std lib.
+
+### chapter 6: process
+
+Introduces starting and executing a new [process](process/src/main.rs) in the easy way.
+
+### chapter 7: channel
+
+Introduces each [channels](channel/src/main.rs) such as mpsc, mpmc and broadcasters.
+
+### chapter 8: timer/ticker
+
+Introduces [timer and ticker](timer_examples/src/main.rs).
+
+### chapter 9: parking_lot
+
+Introduces [parkiung_lot](parking_lot_examples/src/main.rs).
+
+### chapter 10: crossbeam
+
+Introduces [crossbeam](crossbeam_examples/src/main.rs).
+
+### chapter 11: rayon
+
+Introduces [rayon](rayon_examples/src/main.rs).
+
+### chapter 12: tokio
+
+Introduces [tokio](tokio_examples/src/main.rs).
+
+
+### chapter n: special
 
 some special synchronization primitives and concurrency libs only for special single purpose.

book/images/gear.png

@@ -6,4 +6,3 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dashmap = "5.4.0"