feat: added a git ignore and changed the build output path

.gitignore

@@ -0,0 +1 @@
+tmp

makefile

@@ -4,10 +4,10 @@ run:
 	@go run cmd/godb/main.go
 
 build:
-	@go build -o ${BINARY_NAME} cmd/godb/main.go
+	@go build -o tmp/${BINARY_NAME} cmd/godb/main.go
 
 start:
-	@./${BINARY_NAME}
+	@./tmp/${BINARY_NAME}
 
 clean:
 	@go clean