update readme

README.md

@@ -8,7 +8,31 @@
 # Overview
 
 This is an implementation of the consistent hashing hashring data structure.
-For more info please read the [docs][godoc-url].
+
+In general, consistent hashing is all about mapping objects from a very big set
+of values (e.g., request id) to objects from a quite small set (e.g. server
+address). The word "consistent" means that it can produce consistent mapping on
+different machines or processes without additional state exchange and
+communication.
+
+For more theory about the subject please see this [great
+document][stanford-doc].
+
+For more info about the package please read the [docs][godoc-url].
+
+# The Why?
+
+This is an approach for load distribution across servers which I found
+convinient to be used in a few projects I had worked on in the past. 
+
+I think it is good to implement it from scratch to synthesize all of my
+experience of work with it and share it with the community in hope it will help
+to build something good.
+
+Two values of this packages are:
+1) Efficiency of concurrent read operations
+2) Correct handling of write operations (the order of adding items on different
+processes doesn't matter; hash collisions are kept in mind).
 
 # Installation
 
@@ -50,7 +74,8 @@ func (s StringItem) WriteTo(w io.Writer) (int64, error) {
 ```
 
 
-[godoc-image]: https://godoc.org/github.com/gobwas/hashring?status.svg
-[godoc-url]:   https://godoc.org/github.com/gobwas/hashring
-[ci-badge]:    https://github.com/gobwas/hashring/actions/workflows/main.yml/badge.svg?branch=main
-[ci-url]:      https://github.com/gobwas/hashring/actions/workflows/main.yml
+[godoc-image]:  https://godoc.org/github.com/gobwas/hashring?status.svg
+[godoc-url]:    https://godoc.org/github.com/gobwas/hashring
+[ci-badge]:     https://github.com/gobwas/hashring/actions/workflows/main.yml/badge.svg?branch=main
+[ci-url]:       https://github.com/gobwas/hashring/actions/workflows/main.yml
+[stanford-doc]: https://theory.stanford.edu/~tim/s16/l/l1.pdf