Created a skeleton of the app

.gitignore

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+/src/vendor/

composer.json

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+{
+    "name": "belle/ant-cms",
+    "type": "project",
+    "description": "A simple CMS built with PHP and Markdown",
+    "minimum-stability": "stable",
+    "require": {
+        "michelf/php-markdown": "^2.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "Belle\\AntCms\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Belle Aerni",
+            "email": "belleaerni@gmail.com"
+        }
+    ],
+    "config": {
+        "vendor-dir": "src/vendor"
+    }
+}

composer.lock

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+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "66ce6cf62e0203516b5e2e40d90fac81",
+    "packages": [
+        {
+            "name": "michelf/php-markdown",
+            "version": "2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/michelf/php-markdown.git",
+                "reference": "eb176f173fbac58a045aff78e55f833264b34e71"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/michelf/php-markdown/zipball/eb176f173fbac58a045aff78e55f833264b34e71",
+                "reference": "eb176f173fbac58a045aff78e55f833264b34e71",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^3.0",
+                "phpstan/phpstan": ">=1.0",
+                "phpstan/phpstan-phpunit": ">=1.0",
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Michelf\\": "Michelf/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Michel Fortin",
+                    "email": "michel.fortin@michelf.ca",
+                    "homepage": "https://michelf.ca/",
+                    "role": "Developer"
+                },
+                {
+                    "name": "John Gruber",
+                    "homepage": "https://daringfireball.net/"
+                }
+            ],
+            "description": "PHP Markdown",
+            "homepage": "https://michelf.ca/projects/php-markdown/",
+            "keywords": [
+                "markdown"
+            ],
+            "support": {
+                "issues": "https://github.com/michelf/php-markdown/issues",
+                "source": "https://github.com/michelf/php-markdown/tree/2.0.0"
+            },
+            "time": "2022-09-26T12:21:08+00:00"
+        }
+    ],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": [],
+    "plugin-api-version": "2.3.0"
+}

src/.htaccess

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+RewriteEngine On
+RewriteRule ^(.*)$ index.php [QSA,L]

src/AntCMS/App.php

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+<?php
+use Michelf\Markdown;
+
+class AntCMS {
+    public function renderPage($page, $params = null){
+        $content = $this->getPage($page);
+        if(!$content){
+            $this->renderException("404");
+        } else {
+            echo Markdown::defaultTransform($content);
+        }
+    }
+
+    public function renderException($exceptionCode){
+        $content  = "# Error";
+        $content .= "That request caused an $exceptionCode";
+        echo Markdown::defaultTransform($content);
+    }
+
+    public function getPage($page){
+        $page = strtolower($page);
+        $pagePath = appDir . "/Content/$page.md";
+        if(file_exists($pagePath)){
+            try {
+                $pageContents = file_get_contents($pagePath);
+                return $pageContents;
+            } catch (Exception $e) {
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
+    
+}

src/Content/index.md

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+# Hello World
+
+This is the index.md file for my AntCMS project!
+If you see this, it works!

src/index.php

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+<?php
+
+error_reporting(E_ALL);
+ini_set('display_errors', 1);
+
+const appDir = __DIR__;
+require_once __DIR__ . '/vendor/autoload.php';
+require_once __DIR__ . '/AntCMS/App.php';
+
+use \AntCMS;
+$antCms = new AntCMS();
+$requestedPage = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
+$indexes = ['/', '/index.php', '/index.html'];
+if (in_array($requestedPage, $indexes)) {
+    $antCms->renderPage('index');
+} else {
+    $antCms->renderPage($requestedPage);
+}