Cleanup and refactor, in preparation for plugin support. (#318)

* Work started moving converters to individual files.
* Significant cleanup and refactor.
* Moved everything to a packages subfolder.
* Added sample plugin.
* Added instructions to the README.md
* Bumped version, and added a note about compatibility.

packages/markitdown/tests/test_files/test.json

@@ -0,0 +1,10 @@
+{
+    "key1": "string_value",
+    "key2": 1234,
+    "key3": [
+        "list_value1",
+        "list_value2"
+    ],
+    "5b64c88c-b3c3-4510-bcb8-da0b200602d8": "uuid_key",
+    "uuid_value": "9700dc99-6685-40b4-9a3a-5e406dcb37f3"
+}

packages/markitdown/tests/test_files/test_mskanji.csv

@@ -0,0 +1,4 @@
+<EFBFBD><EFBFBD><EFBFBD>O,<EFBFBD>N<EFBFBD><EFBFBD>,<EFBFBD>Z<EFBFBD><EFBFBD>
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Y,30,<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+<EFBFBD>O<EFBFBD>؉p<EFBFBD>q,25,<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>~,35,<EFBFBD><EFBFBD><EFBFBD>É<EFBFBD>

packages/markitdown/tests/test_files/test_notebook.ipynb

@@ -0,0 +1,89 @@
+{
+    "cells": [
+        {
+            "cell_type": "markdown",
+            "id": "0f61db80",
+            "metadata": {},
+            "source": [
+                "# Test Notebook"
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": 11,
+            "id": "3f2a5bbd",
+            "metadata": {},
+            "outputs": [
+                {
+                    "name": "stdout",
+                    "output_type": "stream",
+                    "text": [
+                        "markitdown\n"
+                    ]
+                }
+            ],
+            "source": [
+                "print('markitdown')"
+            ]
+        },
+        {
+            "cell_type": "markdown",
+            "id": "9b9c0468",
+            "metadata": {},
+            "source": [
+                "## Code Cell Below"
+            ]
+        },
+        {
+            "cell_type": "code",
+            "execution_count": 10,
+            "id": "37d8088a",
+            "metadata": {},
+            "outputs": [
+                {
+                    "name": "stdout",
+                    "output_type": "stream",
+                    "text": [
+                        "42\n"
+                    ]
+                }
+            ],
+            "source": [
+                "# comment in code\n",
+                "print(42)"
+            ]
+        },
+        {
+            "cell_type": "markdown",
+            "id": "2e3177bd",
+            "metadata": {},
+            "source": [
+                "End\n",
+                "\n",
+                "---"
+            ]
+        }
+    ],
+    "metadata": {
+        "kernelspec": {
+            "display_name": "Python 3",
+            "language": "python",
+            "name": "python3"
+        },
+        "language_info": {
+            "codemirror_mode": {
+                "name": "ipython",
+                "version": 3
+            },
+            "file_extension": ".py",
+            "mimetype": "text/x-python",
+            "name": "python",
+            "nbconvert_exporter": "python",
+            "pygments_lexer": "ipython3",
+            "version": "3.12.8"
+        },
+        "title": "Test Notebook Title"
+    },
+    "nbformat": 4,
+    "nbformat_minor": 5
+}