Add service catalog definitions for services

Signed-off-by: Ara Pulido <ara.pulido@datadoghq.com>

Author: arapulido

service-definitions/README.md

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+# Service Catalog Definitions
+
+You can use the YAML files on this folder as a base to add service definitions for your services, for them to appear in the new [Service Catalog page](https://docs.datadoghq.com/tracing/faq/service_catalog/).
+
+To send the service definitions to your Datadog org, edit the YAML files to include the correct links (for example, links to the right notebooks in your org for runbooks) and use the API to POST those definitions:
+
+```
+curl -vvvv --request POST 'https://api.datadoghq.com/api/unstable/services/definition' \
+--header 'DD-API-KEY: <your_api_key>' \
+--header 'DD-APPLICATION-KEY: <your_app_key>' \
+--header 'Content-Type: application/json' \
+--data-binary '@<file.yaml>'
+```
+
+After sending the definitions, this is how your Service Catalog page should look like:
+
+![Screenshot for the service catalog page](./screenshot.png)

service-definitions/ads.yaml

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+---
+schema-version: v2
+dd-service: advertisements
+team: ads-team 
+contacts:
+  - type: slack
+    contact: http://slack/e-commerce
+  - type: email 
+    name: Ads Engineering Team
+    contact: ads@example.com  
+links: 
+  - name: Runbook
+    type: runbook
+    url: http://runbook/advertisements
+repos: 
+  - name: Source 
+    provider: github 
+    url: https://github.com/DataDog/ecommerce-workshop/tree/main/ads-service
+docs: 
+  - name: Ads Team
+    provider: wiki
+    url: http://wiki/ads-team
+tags:
+  - app:storedog
+  - cost-center:engineering
+

service-definitions/discounts.yaml

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+---
+schema-version: v2
+dd-service: discounts 
+team: discounts-team 
+contacts:
+  - type: slack
+    contact: http://slack/e-commerce
+  - type: email 
+    name: Discounts Engineering Team
+    contact: discounts@example.com  
+links: 
+  - name: Runbook
+    type: runbook
+    url: http://runbook/discounts
+repos: 
+  - name: Source 
+    provider: github 
+    url: https://github.com/DataDog/ecommerce-workshop/tree/main/discounts-service
+docs: 
+  - name: Discounts Team
+    provider: wiki
+    url: http://wiki/discounts-team
+tags:
+  - app:storedog
+  - cost-center:engineering

service-definitions/frontend.yaml

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+---
+schema-version: v2
+dd-service: store-frontend 
+team: frontend-team 
+contacts:
+  - type: slack
+    contact: http://slack/e-commerce
+  - type: email 
+    name: Frontend Engineering Team
+    contact: frontend@example.com  
+links: 
+  - name: Runbook
+    type: runbook
+    url: http://runbook/store-frontend
+repos: 
+  - name: Source 
+    provider: github 
+    url: https://github.com/DataDog/ecommerce-workshop/tree/main/store-frontend
+docs: 
+  - name: Frontend Team
+    provider: wiki
+    url: http://wiki/frontend-team
+tags:
+  - app:storedog
+  - cost-center:engineering
+---
+schema-version: v2
+dd-service: store-frontend-cache 
+team: frontend-team 
+contacts:
+  - type: slack
+    contact: http://slack/e-commerce
+  - type: email 
+    name: Frontend Engineering Team
+    contact: frontend@example.com  
+links: 
+  - name: Runbook
+    type: runbook
+    url: http://runbook/store-frontend
+repos: 
+  - name: Source 
+    provider: github 
+    url: https://github.com/DataDog/ecommerce-workshop/tree/main/store-frontend
+docs: 
+  - name: Frontend Team
+    provider: wiki
+    url: http://wiki/frontend-team
+tags:
+  - app:storedog
+  - cost-center:engineering
+---
+schema-version: v2
+dd-service: store-frontend-sqlite 
+team: frontend-team 
+contacts:
+  - type: slack
+    contact: http://slack/e-commerce
+  - type: email 
+    name: Frontend Engineering Team
+    contact: frontend@example.com  
+links: 
+  - name: Runbook
+    type: runbook
+    url: http://runbook/store-frontend
+repos: 
+  - name: Source 
+    provider: github 
+    url: https://github.com/DataDog/ecommerce-workshop/tree/main/store-frontend
+docs: 
+  - name: Frontend Team
+    provider: wiki
+    url: http://wiki/frontend-team
+tags:
+  - app:storedog
+  - cost-center:engineering