chore: add comments on installTemplate method (#312)

* chore: add comments on installTemplate method

* improve explanation

lib/generator.js

@@ -286,13 +286,19 @@ class Generator {
           } else { // Template is not a filesystem path...
             const templatePath = path.resolve(DEFAULT_TEMPLATES_DIR, this.templateName);
             if (await isLocalTemplate(templatePath)) {
+              // This "if" is covering the following workflow:
+              // ag asyncapi.yaml ../html-template
+              // The previous command installs a template called @asyncapi/html-template
+              // And now we run the command again but with the resolved name:
+              // ag asyncapi.yaml @asyncapi/html-template
+              // The template name doesn't look like a file system path but we find
+              // that the package is already installed and it's a symbolic link.
               const { resolvedLink } = await getLocalTemplateDetails(templatePath);
               console.info(`This template has already been installed and it's pointing to your filesystem at ${resolvedLink}.`);
             }
             installedPkg = require(path.resolve(templatePath, PACKAGE_JSON_FILENAME));
           }
 
-
           return resolve({
             name: installedPkg.name,
             version: installedPkg.version,
@@ -303,6 +309,8 @@ class Generator {
         }
       }
 
+      // NOTE: npmi creates symbolic links inside DEFAULT_TEMPLATES_DIR
+      // (node_modules) for local packages, i.e., those located in the file system.
       npmi({
         name: this.templateName,
         install: force,