It's not very expansive at the moment, because there's not much you can format in a console window, but it's got all the basics you'd need

Left and right angle-brackets can be made without creating tags by using the escape tags: <lt> -> < <gt> -> >

To add a newline use the <br>

Adds a tab

Sets the backround to yellow between the tags

Sets the text between the tags to bold.

Encloses the inner content with a border like so:

  <h1>Test Text</h1>

    becomes:

  ┌───────────┐
  │ Test Text │
  └───────────┘

Sets the text between the tags to an arbitrary colour of choice for the foreground and background. <col fg=BLACK bg=CYAN>This text is black on cyan!</col>

Note: <col> by itself also resets the colours to default, so <col fg=lime>bla bla<col> is also valid