Add build instructions and installation guide (#172)

Fixes #65 - Add build targets to Makefile and Installation section to README
with build instructions, prerequisites, and usage examples.

Signed-off-by: yxxhero <aiopsclub@163.com>

Author: yxxhero

Makefile

@@ -6,6 +6,14 @@ test:
 test/verbose:
 	RETAIN_TEMP_DIR=1 go test -v ./...
 
+.PHONY: build
+build:
+	go build -o chartify ./cmd/chartify
+
+.PHONY: build/chartreposerver
+build/chartreposerver:
+	go build -o chartreposerver ./cmd/chartreposerver
+
 .PHONY: act
 act:
 	act

README.md

@@ -6,6 +6,40 @@
 
 `chartify` is intended to be run immediately before running `helm upgrade --install`. For example, instead of forking a helm chart, you should be able to prepend a `chartify` step into your deployment job in your CD pipeline. `chartify` isn't intended to create a fork of a chart. The output of `chartify` is a helm chart that is pre-rendered with all the helm values provided to `chartify`.
 
+## Installation
+
+### Build from source
+
+Build the CLI tool:
+
+```bash
+make build
+```
+
+Or build manually:
+
+```bash
+go build -o chartify ./cmd/chartify
+```
+
+Build the chart repo server:
+
+```bash
+make build/chartreposerver
+```
+
+Or build manually:
+
+```bash
+go build -o chartreposerver ./cmd/chartreposerver
+```
+
+### Prerequisites
+
+- Go 1.25.4+
+- Helm v4.1.0 (helm command)
+- Kustomize v5.8.0+ (kustomize command, optional, for kustomize integration)
+
 ## CLI
 
 Beyond it's usage with helmfile, it also provides a basic CLI application that can be run independently.
@@ -16,4 +50,15 @@ The simplest usage of the command is:
 $ chartify $RELEASE $CHART -o $OUTPUT_DIR
 ```
 
+Examples:
+
+```bash
+# Build and run with a Helm chart
+make build
+./chartify -o /tmp/output test-release testdata/charts/log
+
+# Build and run with Kubernetes manifests
+./chartify -o /tmp/output test-release testdata/kube_manifest_yml
+```
+
 See `chartify -h` or `go run ./cmd/chartify -h` for more information.