init: add codes

README.md

@@ -1,2 +1,42 @@
 # sched
 Simple Golang parallel scheduler.
+
+## Usage
+### Add one to each element in arr
+```go
+arr := make([]uint8, 64*1024*1024) // 64M
+_, _ = NewTask(arr, func(_ int, x []byte) ([]byte, error) {
+    for i := range x {
+        arr[i]++
+    }
+    return arr, nil
+}, false, false).Collect(2*1024*1024, true, true) // 2M batch
+```
+### Get HTTP contents for earh URL
+```go
+contents, err := NewTask(urls, func(_ int, urls []string) ([]string, error) {
+    for i, u := range url {
+        str, err := ... // get content
+        if err != nil {
+            return nil, err
+        }
+        urls[i] = str   // overlap
+    }
+    return urls, nil    // return result
+}, false, false).Collect(4, false, false) // 4 URLs as a group
+```
+
+## Bechmark
+A simple self-incrasing process is performed on a 64M uint8 array.
+```c
+goos: darwin
+goarch: arm64
+pkg: github.com/fumiama/sched
+cpu: Apple M1
+BenchmarkSched/single-8         	1000000000	         0.02992 ns/op	2242952686132.55 MB/s	       0 B/op	       0 allocs/op
+BenchmarkSched/para512K-8       	1000000000	         0.02483 ns/op	2702751323377.81 MB/s	       0 B/op	       0 allocs/op
+BenchmarkSched/para1M-8         	1000000000	         0.02492 ns/op	2693026104055.06 MB/s	       0 B/op	       0 allocs/op
+BenchmarkSched/para2M-8         	1000000000	         0.02133 ns/op	3146490138908.33 MB/s	       0 B/op	       0 allocs/op
+PASS
+ok  	github.com/fumiama/sched	1.119s
+```