adding markdown cheatsheet

markdown.txt

@@ -0,0 +1,76 @@
+Basic Syntax
+
+These are the elements outlined in John Gruber’s original design document. All Markdown applications support these elements.
+
+Heading
+# H1
+## H2
+### H3
+
+Bold
+**bold text**
+
+Italic
+*italicized text*
+
+Blockquote
+> blockquote
+
+Ordered List
+1. First item
+2. Second item
+3. Third item
+
+Unordered List
+- First item
+- Second item
+- Third item
+
+Code
+`code`
+
+Horizontal Rule
+---
+
+Link
+[title](https://www.example.com)
+
+Image
+![alt text](image.jpg)
+
+
+Extended Syntax
+
+Table
+| Syntax | Description |
+| ----------- | ----------- |
+| Header | Title |
+| Paragraph | Text |
+
+Fenced Code Block
+```
+{
+  "firstName": "John",
+  "lastName": "Smith",
+  "age": 25
+}
+```
+
+Footnote
+Here's a sentence with a footnote. [^1]
+[^1]: This is the footnote.
+
+Heading ID
+### My Great Heading {#custom-id}
+
+Definition List
+term
+: definition
+
+Strikethrough
+~~The world is flat.~~
+
+Task List
+- [x] Write the press release
+- [ ] Update the website
+- [ ] Contact the media