feat: add README

README.md

@@ -0,0 +1,50 @@
+# go-gen-cert
+
+## Configuration
+If you are on `dev` environment, like I've been doing, you must create `.env` file similar as `.env.example` in this repo:
+
+```bash
+VIPER_CONFIG=your-viper-file-name-without-extension
+VIPER_CONFIG_TYPE=yaml
+ENV=dev
+```
+
+Then add viper configuration file, yaml for example, in your root directory:
+```yaml
+export_dir: "/home"
+ca:
+    serial_number: 12152 # serial number
+    subject:
+        organization: "yourdomain.com"
+        common_name: "*.yourdomain.com"
+    key_usage: 1
+    ext_key_usage: 
+        - 1
+        - 2
+        duration: 518400 #1 year
+client:
+    serial_number: 12151232 # serial number
+    subject:
+        organization: "yourdomain.com"
+        country: "RM"
+        province: "REML"
+        locality: ""
+        street_address: ""
+        postal_code: ""
+    subject_key_id:
+        - 1
+        - 2
+        - 3
+        - 4
+        - 6
+    key_usage: 1
+    ext_key_usage: 
+        - 1
+        - 2
+    duration: 518400
+```
+## Execution
+Then you can just run 
+```bash
+go run main.go
+```