added README

README.md

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+# Gomoku engine
+
+## Description
+
+simple gomoku engine written in Rust  
+uses AlphaBeta pruning and caching with zobrist hashing
+
+TODO: iterative deepening
+
+## Modes
+
+### 1. interactive
+
+`gomoku <player> <depth> [start]`
+
+- player - which symbol should engine play as ('x' or 'o')
+- depth - how many plies in future should the engine look
+- start - should the engine be first player ('true' or 'false')
+
+reads from stdin in format `x,y`
+
+### 2. single position
+
+`gomoku <player> <depth> debug <path-to-input-file>`
+
+- player - which symbol should engine play as ('x' or 'o')
+- depth - how many plies in future should the engine look
+- path-to-input-file - path to file in specified format
+
+evaluates single positions and returns its move
+
+input file example:
+
+```txt
+---------
+---------
+---x-----
+---xoo---
+----xo---
+---xxxo--
+------oo-
+--------x
+---------
+```