chore(docs): add readme and openapi specs for tenants

apps/tenant-manager/LICENSE

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apps/tenant-manager/README.md

-# Gaia-X OCM Tenant Manager
+# OCM Tenant Manager
 
-The Gaia-X OCM Tenant Manager is a component of the Gaia-X Open Common Metadata (OCM) project. It provides functionality for managing tenants within the Gaia-X ecosystem.
+## Introduction
+The OCM Tenant Manager is a component of the Gaia-X Open Common Metadata (OCM) project. It provides functionality for managing tenants within the Gaia-X ecosystem.
 
-## Table of Contents
+The OCM Tenant Manager enables you to:
+- Create new tenants
+- List existing tenants
 
-- [Introduction](#introduction)
-- [Features](#features)
-- [Installation](#installation)
-- [Usage](#usage)
-- [Contributing](#contributing)
-- [License](#license)
+## Prerequisites
+Ensure you have Node.js installed ([official Node.js website](https://nodejs.org)).
 
-## Introduction
+## Configuration
+Set configuration via environment variables or an `.env` file:
 
-The Gaia-X OCM Tenant Manager is designed to facilitate the management of tenants in the Gaia-X ecosystem. It allows users to create, update, and delete tenants, as well as manage their associated resources.
+| Property | Description | Default |
+|---|---|---|
+| `HTTP_HOSTNAME` | HTTP server hostname | `0.0.0.0` |
+| `HTTP_PORT` | HTTP server port | `3000` |
+| `NATS_URL` | NATS Server URL | `nats://localhost:4222` |
+| `NATS_USER` | NATS user |  |
+| `NATS_PASSWORD` | NATS password |  |
+| `NATS_MONITORING_URL` | NATS Monitoring URL | `http://localhost:8222` |
 
-## Features
+## Usage
 
-- Create new tenants
-- Update existing tenants
-- Delete tenants
-- Manage tenant resources
+Start in development mode:
+```bash
+pnpm start
+```
+
+### Operations
+
+#### Create a tenant
+
+```bash
+curl -X POST -d '{"label":"Alice"}' http://ocm-indy.xfsc.dev/v1/tenants
+```
+
+Response:
+
+```json
+{
+  "statusCode": 201,
+  "data": {
+    "_tags": {},
+    "metadata": {},
+    "storageVersion": "0.5",
+    "id": "907a9007-29fb-448e-aa91-34f28e4db5ce",
+    "createdAt": "2024-03-12T08:46:26.615Z",
+    "config": {
+      "label": "issuer",
+      ...
+    },
+    ...
+  }
+}
+```
+
+#### List existing tenants
 
-## Installation
+```bash
+curl -X GET http://ocm-indy.xfsc.dev/v1/tenants
+```
 
-To install the Gaia-X OCM Tenant Manager, follow these steps:
+Response:
+```json
+{
+  "statusCode": 200,
+  "data": ["907a9007-29fb-448e-aa91-34f28e4db5ce"]
+}
+```
 
-1. Clone the repository:
+## API Reference
+For detailed documentation, refer to the [OpenAPI Specification](openapi.json).
 
-   ```bash
-   git clone https://github.com/gaia-x/ocm-tenant-manager.git
+## License
+Licensed under the Apache 2.0 License ([LICENSE](LICENSE)).

apps/tenant-manager/openapi.json

+{
+  "openapi": "3.0.0",
+  "paths": {
+    "/v1/tenants": {
+      "get": {
+        "operationId": "TenantsController_find",
+        "parameters": [],
+        "responses": { "200": { "description": "" } },
+        "tags": ["Tenants"]
+      },
+      "post": {
+        "operationId": "TenantsController_create",
+        "parameters": [],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": { "$ref": "#/components/schemas/CreateTenantPayload" }
+            }
+          }
+        },
+        "responses": { "201": { "description": "" } },
+        "tags": ["Tenants"]
+      }
+    }
+  },
+  "info": {
+    "title": "Gaia-X OCM Tenant Manager",
+    "description": "",
+    "version": "1.0.0",
+    "contact": {}
+  },
+  "tags": [],
+  "servers": [],
+  "components": {
+    "schemas": {
+      "CreateTenantPayload": {
+        "type": "object",
+        "properties": {
+          "label": {
+            "type": "string",
+            "description": "The label of the tenant",
+            "example": "Alice"
+          }
+        },
+        "required": ["label"]
+      }
+    }
+  }
+}