Polish readme and remove lark's remnants

README.md

@@ -1,10 +1,24 @@
 # pytopas
 
-This is the parser for Bruker's TOPAS macro language. We have compared two canonical parsing approaches for Python: `lark` vs. `pyparsing`.
+This is an early version of Bruker's TOPAS macro language parser, used by [commercial](https://www.bruker.com/de/products-and-solutions/diffractometers-and-x-ray-microscopes/x-ray-diffractometers/diffrac-suite-software.html) and [academic](http://www.topas-academic.net) TOPAS code. We have compared two canonical parsing approaches for Python, `lark` vs. `pyparsing`, and ended up with `pyparsing` being more convenient for debugging.
+
+
+## Installation
+
+`pip install .`
+
+Install package with optional dependencies with `pip install -e .[lint,test,release]`
+
 
 ## Usage
 
-Parse TOPAS input and convert it to JSON:
+Parse a TOPAS macro language node with:
+
+```sh
+echo "xdd { 42 }" | topas2json - | json2topas -
+```
+
+More specifically, parse TOPAS input and convert it to JSON with:
 
 ```python
 import json
@@ -35,7 +49,8 @@ print(src)
 
 ```
 
-## Command line utilities
+
+## CLI
 
 After installing the package, two command line utilities will be available.
 
@@ -65,9 +80,6 @@ options:
 
 ```
 
-## Development
-
-Install package with optional dependencies: `pip install -e .[lint,test,release]`
 
 ## License