added top level makefile for simpler dev

Makefile

@@ -0,0 +1,10 @@
+default: ext
+
+ext: ## [DEFAULT] build c extension in place
+	python setup.py build_ext --inplace
+
+clean: ## Remove the build folder and the shared library
+	rm -rf build/ creader.cpython*
+
+help: # from compiler explorer
+	@grep -E '^[0-9a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'

README.md

@@ -8,6 +8,12 @@ Useful links:
 
 ### Build instructions
 
+**Simplified build using make** 
+```bash
+make #build c extension inplace
+```
+
+**Manual build**
 ```bash
 
 #build in place and use from the same folder