docs(README): add readme

README.md

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+# Console progress bar for Rust
+
+Console progress bar for Rust Inspired from [pb.go](github.com/cheggaaa/pb), support and 
+tested on MacOS and Linux(should work on Windows too, but not tested yet).
+
+### Examples
+1. simple example
+
+```rust
+extern crate pb;
+
+use pb::ProgressBar;
+use std::thread;
+
+fn main() {
+    let count = 1000;
+    let mut pb = ProgressBar::new(count);
+    for _ in 0..count {
+        pb.inc();
+        thread::sleep_ms(200);
+    }
+    println("done!");
+}
+```
+
+2. Broadcast writing(simple file copying)
+
+```rust
+extern crate pb;
+
+use std::io::copy;
+use std::fs::{self, File};
+use pb::{ProgressBar, Units};
+
+fn main() {
+    let fname = "/usr/share/dict/words";
+    let mut file = File::open(fname).unwrap();
+    let n_bytes = fs::metadata(fname).unwrap().len() as usize;
+    let mut pb = ProgressBar::new(n_bytes);
+    pb.set_units(pb::Units::Bytes);
+    let mut dfile = File::create("copy-words").unwrap();
+    let mut handle = dfile.broadcast(&mut pb);
+    copy(&mut file, &mut handle).unwrap();
+    println!("done!");
+}
+```
+
+### License
+MIT
+