Added documentation for creation of a backstage template

docs/technical-documentation/solution/tools/Backstage/template-creation/_index.md

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+## Adding a New Backstage Template to EDPBuilder
+
+### 1. Clone the Stacks Repository
+Clone the stacks repository containing the stacks for edpuilder<br> 
+`git clone https://forgejo.edf-bootstrap.cx.fg1.ffm.osc.live/DevFW-CICD/stacks.git`
+
+### 2. Create a Directory for Your Template
+Navigate to the directory:<br>
+`stacks/template/stacks/ref-implementation/backstage-templates/entities`
+
+Create a new directory for your template within this path.
+
+### 3. Add a `template.yaml` File
+In the newly created template directory, create a file named `template.yaml`. This file will define the steps of your template pipeline.
+
+Each step in the pipeline must include:
+- **Name**: A descriptive name that will be displayed in the Backstage interface.
+- **Action**: An action from the list of available Backstage actions.
+- **Parameters**: Input parameters required by the action.
+
+You can view the list of available actions in the Backstage interface at the following URL:  
+`{address_of_your_backstage}/create/actions`
+
+#### Example of `template.yaml`:
+```yaml
+apiVersion: scaffolder.backstage.io/v1beta3
+kind: Template
+metadata:
+  name: my-new-template
+  title: My New Template
+  description: A description of the template.
+spec:
+  owner: team@example.com
+  steps:
+    - id: fetch
+      name: Fetch Repository
+      action: fetch:plain
+      input:
+        url: https://github.com/example/repo
+    - id: log
+      name: Log Step
+      action: debug:log
+      input:
+        message: "Processing template pipeline"
+```
+
+### 4. Add a skeleton Directory
+Within your template directory, create a subdirectory named skeleton. This is where you can place the files for your template.
+
+### 5. Update the `catalog-info.yaml` File
+To make your new template visible in Backstage, update the `catalog-info.yaml` file located in:<br>
+`stacks/template/stacks/ref-implementation/backstage-templates`
+
+Add the path to the `template.yaml` file of your new template under the `targets` section.
+
+#### Example `catalog-info.yaml`:
+```yaml
+apiVersion: backstage.io/v1alpha1
+kind: Location
+metadata:
+  name: basic-example-templates
+  description: A collection of example templates
+spec:
+  targets:
+    - ./basic/template.yaml
+    - ./argo-workflows/template.yaml
+    - ./app-with-bucket/template.yaml
+    - ./demo-go-hello-world/template.yaml
+    - ./spring-petclinic/template.yaml
+    - ./my-new-template/template.yaml
+---
+apiVersion: backstage.io/v1alpha1
+kind: Location
+metadata:
+  name: basic-organization
+  description: Basic organization data
+spec:
+  targets:
+    - ./organization/guests.yaml
+```