source-productboard contribution from pabloescoder (#45449)

Co-authored-by: Octavia Squidington III <[email protected]>

airbyte-integrations/connectors/source-productboard/README.md

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+# Productboard
+This directory contains the manifest-only connector for `source-productboard`.
+https://www.productboard.com/
+
+## Documentation reference:
+Visit https://developer.productboard.com/reference/ for API documentation
+
+## Authentication setup
+`source-productboard` uses API Token authentication. 
+Visit https://developer.productboard.com/reference/authentication#public-api-access-token for steps to generate an access token.
+
+## Usage
+There are multiple ways to use this connector:
+- You can use this connector as any other connector in Airbyte Marketplace.
+- You can load this connector in `pyairbyte` using `get_source`!
+- You can open this connector in Connector Builder, edit it, and publish to your workspaces.
+
+Please refer to the manifest-only connector documentation for more details.
+
+## Local Development
+We recommend you use the Connector Builder to edit this connector.
+
+But, if you want to develop this connector locally, you can use the following steps.
+
+### Environment Setup
+You will need `airbyte-ci` installed. You can find the documentation [here](https://github.com/airbytehq/airbyte/blob/master/airbyte-ci/connectors/pipelines/README.md).
+
+### Build
+This will create a dev image (`source-productboard:dev`) that you can use to test the connector locally.
+```bash
+airbyte-ci connectors --name=source-productboard build
+```
+
+### Test
+This will run the acceptance tests for the connector.
+```bash
+airbyte-ci connectors --name=source-productboard test
+```
+

airbyte-integrations/connectors/source-productboard/acceptance-test-config.yml

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+# See [Connector Acceptance Tests](https://docs.airbyte.com/connector-development/testing-connectors/connector-acceptance-tests-reference)
+# for more information about how to configure these tests
+connector_image: airbyte/source-productboard:dev
+acceptance_tests:
+  spec:
+    tests:
+      - spec_path: "manifest.yaml"
+  connection:
+    bypass_reason: "This is a builder contribution, and we do not have secrets at this time"
+  discovery:
+    bypass_reason: "This is a builder contribution, and we do not have secrets at this time"
+  basic_read:
+    bypass_reason: "This is a builder contribution, and we do not have secrets at this time"
+  incremental:
+    bypass_reason: "This is a builder contribution, and we do not have secrets at this time"
+  full_refresh:
+    bypass_reason: "This is a builder contribution, and we do not have secrets at this time"