source-circleci contribution from btkcodedev (#46249)

Co-authored-by: Octavia Squidington III <octavia-squidington-iii@users.noreply.github.com>

docs/integrations/sources/circleci.md

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+# Circleci
+This directory contains the manifest-only connector for [`source-circleci`](https://app.circleci.com/).
+
+## Documentation reference:
+- Visit `https://circleci.com/docs/api/v1/index.html` for V1 API documentation
+- Visit `https://circleci.com/docs/api/v2/index.html` for V2 API documentation
+
+## Authentication setup
+`CircleCI` uses api key authentication, Visit `https://app.circleci.com/settings/user/tokens` for getting your api keys.
+
+## Configuration
+
+| Input | Type | Description | Default Value |
+|-------|------|-------------|---------------|
+| `api_key` | `string` | API Key.  |  |
+| `org_id` | `string` | Organization ID. The org ID found in `https://app.circleci.com/settings/organization/circleci/xxxxx/overview` |  |
+| `start_date` | `string` | Start date.  |  |
+| `project_id` | `string` | Project ID found in the project settings.  |  |
+| `job_id` | `string` | Job ID for fetching information found in URL.  |  |
+| `workflow_id` | `string` | Workflow ID of a project pipeline.  |  |
+| `workflow_name` | `string` | Workflow name for fetching information.  |  |
+| `job_number` | `string` | Job Number of the workflow.  | `2` |
+
+## Streams
+| Stream Name | Primary Key | Pagination | Supports Full Sync | Supports Incremental |
+|-------------|-------------|------------|---------------------|----------------------|
+| context | id | DefaultPaginator | ✅ |  ✅  |
+| self_ids | id | DefaultPaginator | ✅ |  ❌  |
+| self_collaborations | id | DefaultPaginator | ✅ |  ❌  |
+| me | analytics_id | DefaultPaginator | ✅ |  ✅  |
+| projects | vcs_url | DefaultPaginator | ✅ |  ❌  |
+| pipelines | id | DefaultPaginator | ✅ |  ✅ |
+| specific_project | id | DefaultPaginator | ✅ |  ❌ |
+| jobs | number | DefaultPaginator | ✅ |  ❌ |
+| workflow | id | DefaultPaginator | ✅ |  ✅ |
+| insights_metrics | project_id | DefaultPaginator | ✅ |  ❌ |
+| insights_branches | id | DefaultPaginator | ✅ |  ❌ |
+| workflow_jobs | id | DefaultPaginator | ✅ |  ✅ |
+
+## Changelog
+
+<details>
+  <summary>Expand to review</summary>
+
+| Version          | Date       |PR| Subject        |
+|------------------|------------|---|----------------|
+| 0.0.1 | 2024-09-29 |[46249](https://github.com/airbytehq/airbyte/pull/46249)| Initial release by [@btkcodedev](https://github.com/btkcodedev) via Connector Builder|
+
+</details>