Add MarkItDown integration (#428)

* Add MarkItDown integration

* Add logo for MarkItDown integration

Author: bogdankostic

integrations/markitdown.md

@@ -0,0 +1,95 @@
+---
+layout: integration
+name: MarkItDown
+description: Use Microsoft's MarkItDown to locally convert PDF, DOCX, PPTX, XLSX, HTML, images, and more into Markdown in Haystack
+authors:
+    - name: deepset
+      socials:
+        github: deepset-ai
+        twitter: deepset_ai
+        linkedin: https://www.linkedin.com/company/deepset-ai/
+pypi: https://pypi.org/project/markitdown-haystack
+repo: https://github.com/deepset-ai/haystack-core-integrations/tree/main/integrations/markitdown
+type: Data Ingestion
+report_issue: https://github.com/deepset-ai/haystack-core-integrations/issues
+logo: /logos/microsoft.png
+version: Haystack 2.0
+toc: true
+---
+
+### **Table of Contents**
+- [Overview](#overview)
+- [Installation](#installation)
+- [Usage](#usage)
+- [License](#license)
+
+## Overview
+
+[MarkItDown](https://github.com/microsoft/markitdown) is a Python library by Microsoft for converting various file formats into Markdown. It supports a wide range of formats including PDF, Word (.docx), PowerPoint (.pptx), Excel (.xlsx), HTML, images, and more — all processed locally.
+
+This integration provides a `MarkItDownConverter` component that wraps Microsoft's MarkItDown library, enabling Haystack users to convert files into Haystack `Document` objects with Markdown content.
+
+## Installation
+
+```bash
+pip install markitdown-haystack
+```
+
+## Usage
+
+### Standalone
+
+```python
+from haystack_integrations.components.converters.markitdown import MarkItDownConverter
+
+converter = MarkItDownConverter()
+result = converter.run(sources=["document.pdf", "report.docx"])
+documents = result["documents"]
+```
+
+You can also pass metadata to attach to the resulting documents:
+
+```python
+from haystack_integrations.components.converters.markitdown import MarkItDownConverter
+
+converter = MarkItDownConverter()
+result = converter.run(
+    sources=["document.pdf", "report.docx"],
+    meta=[{"author": "Alice"}, {"author": "Bob"}]
+)
+documents = result["documents"]
+```
+
+To convert `ByteStream` objects:
+
+```python
+from haystack.dataclasses import ByteStream
+from haystack_integrations.components.converters.markitdown import MarkItDownConverter
+
+converter = MarkItDownConverter()
+bytestream = ByteStream(data=file_bytes, meta={"file_path": "document.pdf"})
+result = converter.run(sources=[bytestream])
+documents = result["documents"]
+```
+
+### In a Haystack Pipeline
+
+```python
+from haystack import Pipeline
+from haystack.components.writers import DocumentWriter
+from haystack.document_stores.in_memory import InMemoryDocumentStore
+from haystack_integrations.components.converters.markitdown import MarkItDownConverter
+
+document_store = InMemoryDocumentStore()
+
+indexing = Pipeline()
+indexing.add_component("converter", MarkItDownConverter())
+indexing.add_component("writer", DocumentWriter(document_store))
+indexing.connect("converter", "writer")
+
+indexing.run({"converter": {"sources": ["a/file/path.pdf", "another/file.docx"]}})
+```
+
+## License
+
+`markitdown-haystack` is distributed under the terms of the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license.