Updated readme for templates

Author: ProtocolNebula

templates/Readme.md

@@ -1,5 +1,42 @@
-# Swagger to Angular - Templates
+# TypeScript OpenApi/Swagger Generator - Templates
 
-Templates specify template for each file type generated, so you can edit them and custom as you like.
+## Details
 
-For now you can only have one template per type.
+This folder contain a list of presets for different languages.
+
+Also you can create your own, it's easy!
+
+## How to create a custom template
+
+### 1 - Duplicate any template folder
+
+To create a new template, first duplicate some folder (recommended `angular2`) to use as base.
+
+Just name it as you whish.
+
+> If you trying to create a preset to push it to the main repo, you should create it in this folder with a **coherent full-name** in **kevab case**.
+> For example for "TypeScript": `type-script`, instead `ts`.
+
+> If you are creating a **custom template** for you own, just create anywhere in your machine/repository, it's not a requirement to be in this folder.
+
+### 2 - Customize your template
+
+This step is the hardest one, you have to change all files to adapt to your Language/Framework/Library.
+
+Just change the current templates/files to that.
+
+### 3 - Generate the api files with your own template
+
+Just launch the command to generate your files BUT changing (or adding) `template` flag (`-t`).
+
+```bash
+# Using a "preset"
+transform-swagger -f URI/TO/SWAGGER/JSON/OR/YAML -o src/generatedApi/ -t type-script
+
+# Using a "custom path"
+transform-swagger -f URI/TO/SWAGGER/JSON/OR/YAML -o src/generatedApi/ -t ./path/to/your/template
+```
+
+### 4 - Just enjoy your saved time!
+
+Easy, right?