feat: add makefile for building git-semver

**Description**:

Add makefile for building `git-semver`.

**Related Issue(s)**:

Implements #23

Signed-off-by: Andrew Brandt <[email protected]>

Author: andrewb1269

.gitignore

@@ -3,3 +3,5 @@ git-semver
 .testworkdir
 
 dist/
+
+/bin

makefile

@@ -0,0 +1,25 @@
+# Makefile at repo root
+
+BINARY_NAME ?= git-semver
+BUILD_DIR := cli
+BIN_DIR := bin
+
+.PHONY: all build clean test
+
+all: build
+
+## Build the CLI into ./bin/
+build:
+	@echo "Building $(BINARY_NAME) from $(BUILD_DIR)..."
+	@mkdir -p $(BIN_DIR)
+	@cd $(BUILD_DIR) && go build -o ../$(BIN_DIR)/$(BINARY_NAME)
+
+## Run all Go tests
+test:
+	@echo "Running tests..."
+	@go test ./...
+
+## Remove build artifacts
+clean:
+	@echo "Cleaning build artifacts..."
+	@rm -rf $(BIN_DIR)/