add makefile and update doc

Makefile

@@ -0,0 +1,14 @@
+EXT :=
+ifeq ($(OS),Windows_NT)
+	EXT = .exe
+endif
+
+BIN := pike$(EXT)
+
+$(BIN):
+	@echo "  ODIN"
+	@odin build . -out:$(BIN)
+
+clean:
+	@echo "  CLEAN"
+	@$(RM) $(BIN)

README.md

@@ -3,13 +3,26 @@ Nonchalant fishing poker game
 
 ![Logo](./assets/images/fih.png)
 
-### WHAT IS pike
+### What is pike
 
 Pike is an exiting fishing extravaganza that mixes poker and fishing into a
 coherent experience that produces minutes of fun! This game is a simple-2D
 fishing-like.
 
-### WHAT INSPIRED pike
+### What inspired pike
 
 Pike was inspired by Balatro and WebFishing--a combination of strategy and
 aesthetic.
+
+### Build
+
+Building for both Windows and Linux use the `Makefile` via:
+
+    $ make
+    $ ./pike
+
+You can clean the working tree with:
+
+    $ make clean
+
+Happy gaming!