Update technical details (#79)

* Update README.md

* Update README.md

* Update README

Author: vbkaisetsu

README.md

@@ -7,7 +7,7 @@ A fast implementation of the Aho-Corasick algorithm using the compact double-arr
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-[Technical details (Japanese)](https://tech.legalforce.co.jp/entry/2022/02/24/140316)
+The main technical ideas behind this library appear in [this paper](https://doi.org/10.48550/arXiv.2207.13870).
 
 ## Overview
 

src/lib.rs

@@ -13,6 +13,9 @@
 //! only supports constant-time state-to-state traversal but also represents each state in the
 //! space of only 12 bytes.
 //!
+//! The main technical ideas behind this library appear in
+//! [this paper](https://doi.org/10.48550/arXiv.2207.13870).
+//!
 //! ## Example: Finding overlapped occurrences
 //!
 //! To search for all occurrences of registered patterns that allow for positional overlap in the