add initial marp implementation with sample content and build configuration

node_modules/highlight.js/lib/languages/diff.js

@@ -0,0 +1,62 @@
+/*
+Language: Diff
+Description: Unified and context diff
+Author: Vasily Polovnyov <vast@whiteants.net>
+Website: https://www.gnu.org/software/diffutils/
+Category: common
+*/
+
+/** @type LanguageFn */
+function diff(hljs) {
+  const regex = hljs.regex;
+  return {
+    name: 'Diff',
+    aliases: [ 'patch' ],
+    contains: [
+      {
+        className: 'meta',
+        relevance: 10,
+        match: regex.either(
+          /^@@ +-\d+,\d+ +\+\d+,\d+ +@@/,
+          /^\*\*\* +\d+,\d+ +\*\*\*\*$/,
+          /^--- +\d+,\d+ +----$/
+        )
+      },
+      {
+        className: 'comment',
+        variants: [
+          {
+            begin: regex.either(
+              /Index: /,
+              /^index/,
+              /={3,}/,
+              /^-{3}/,
+              /^\*{3} /,
+              /^\+{3}/,
+              /^diff --git/
+            ),
+            end: /$/
+          },
+          { match: /^\*{15}$/ }
+        ]
+      },
+      {
+        className: 'addition',
+        begin: /^\+/,
+        end: /$/
+      },
+      {
+        className: 'deletion',
+        begin: /^-/,
+        end: /$/
+      },
+      {
+        className: 'addition',
+        begin: /^!/,
+        end: /$/
+      }
+    ]
+  };
+}
+
+module.exports = diff;