improve UX & DX in Venom CLI (#491)

* feat: improve CLI usage messages
Signed-off-by: scraly <scraly@gmail.com>

* feat: improve CLI usage messages
Signed-off-by: scraly <scraly@gmail.com>
Signed-off-by: GitHub <noreply@github.com>

.gitignore

@@ -20,3 +20,4 @@ tests.log
 ./.venomrc
 test_results.xml
 *.prof
+git-template

cmd/venom/main.go

@@ -11,7 +11,7 @@ import (
 
 var rootCmd = &cobra.Command{
 	Use:   "venom",
-	Short: "Venom - RUN Integration Tests",
+	Short: "Venom aim to create, manage and run your integration tests with efficiency",
 }
 
 func main() {

cmd/venom/run/cmd.go

@@ -301,10 +301,17 @@ func displayArg(ctx context.Context) {
 var Cmd = &cobra.Command{
 	Use:   "run",
 	Short: "Run Tests",
-	Long: `
-$ venom run *.yml
-
-Notice that variables initialized with -var-from-file argument can be overrided with -var argument.`,
+	Example: `  Run all testsuites containing in files ending with *.yml: venom run
+  Run a single testsuite: venom run mytestfile.yml
+  Run a single testsuite and export the result in JSON format in test/ folder: venom run mytestfile.yml --format=json --output-dir=test
+  Run a single testsuite and specify a variable: venom run mytestfile.yml --var="foo=bar"
+  Run a single testsuite and load all variables from a file: venom run mytestfile.yml --var-from-file variables.yaml
+  Run all testsuites containing in files ending with *.yml with verbosity: VENOM_VERBOSE=2 venom run
+  
+  Notice that variables initialized with -var-from-file argument can be overrided with -var argument
+  
+  More info: https://github.com/ovh/venom`,
+	Long: `run integration tests`,
 	PreRun: func(cmd *cobra.Command, args []string) {
 		if len(args) == 0 {
 			path = append(path, ".")