add logging and print file examples

Author: nonnontrivial

examples/README.md

@@ -1,19 +1,17 @@
 # `async-std` Examples
 
-This directory contains example code that makes use of `async-std`.
+This directory contains example code that makes use of `async-std`, each of which can be run from the command line.
 
-Each example can be run from the command line.
+## Examples
 
-For example, [Hello World][hello-world] can be run by running the following:
+- [Hello World][hello-world]
+
+Spawns a task that says hello.
 
 ```
 cargo run --example hello-world
 ```
 
-- [Hello World][hello-world]
-
-Spawns a task that says hello.
-
 - [Line Count][line-count]
 
 Counts the number of lines in a file given as an argument.
@@ -26,6 +24,28 @@ cargo run --example line-count -- ./Cargo.toml
 
 Lists files in a directory given as an argument.
 
+```shell
+cargo run --example list-dir -- .
+```
+
+- [Logging][logging]
+
+Prints the runtime's execution log on the standard output.
+
+```shell
+cargo run --example logging
+```
+
+- [Print File][print-file]
+
+Prints a file given as an argument to stdout.
+
+```shell
+cargo run --example print-file ./Cargo.toml
+```
+
 [hello-world]: https://github.com/async-rs/async-std/blob/master/examples/hello-world.rs
 [line-count]: https://github.com/async-rs/async-std/blob/master/examples/line-count.rs
 [list-dir]: https://github.com/async-rs/async-std/blob/master/examples/list-dir.rs
+[logging]: https://github.com/async-rs/async-std/blob/master/examples/logging.rs
+[print-file]: https://github.com/async-rs/async-std/blob/master/examples/print-file.rs