make changes to readme

Author: itzCozi

README.md

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 # Python Data Library
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 The Python Data Library is a python library file and parser pypi-package, To create a `.pdl` file simply follow this [wiki guide](https://github.com/itzCozi/Python-Developer-Library/wiki). PDL files are marked by the file extension `.pdl` and can be parsed within a python program using the pdlparse pypi package. The file's syntax is made to be simple and easy to learn it follows very pythonic rules to ease developers into the language. `pdl-hl` is the [VSCode extension](https://marketplace.visualstudio.com/items?itemName=CooperRansom.pdl-hl) made for pdl files it offers custom syntax highlighting for python data librarys depending on your color theme.
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+## PDL Highlighting
+In short this extension provides syntax highlighting for types, keywords, comments, strings and symbols, the colors the package uses to highlight is based on your color theme. The example below is using a common theme which is listed [here](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools-themes).
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