adding makefile

Makefile

@@ -0,0 +1,22 @@
+project_name = rule-engine
+
+help: ## This help dialog.
+	@grep -F -h "##" $(MAKEFILE_LIST) | grep -F -v fgrep | sed -e 's/\\$$//' | sed -e 's/##//'
+
+run-local: ## Run the app locally
+	go run main.go
+
+requirements: ## Generate go.mod & go.sum files
+	go mod tidy
+
+clean-packages: ## Clean packages
+	go clean -modcache
+
+test: ## Run the tests
+	go test
+
+test-v: ## Run the tests
+	go test -v
+
+test-cover: ## Run the tests
+	go test -cover

README.md

@@ -132,8 +132,17 @@ Rules have been executed. it passed!
 ```
 
 
-## features
-* Multiple rules by all or any
+## operators
+| operator             | meaning                                         | 
+----------------------|-------------------------------------------------
+| equals               | equals to                                       |
+| notEquals            | not equal to                                    |
+| lessThan             | less than                                       |
+| greaterThan          | greater than                                    |
+| lessThanInclusive    | less than or equal to                           |
+| greaterThanInclusive | greater than or equal to                        |
+| in                   | in a list                                       |
+| notIn                | not in a list                                   |
 
 ## dependencies
 * Go