Update README.md

Author: felix-andreas

README.md

@@ -1,35 +1,49 @@
 # apace
-Depends on Python 3.7 
+**apace** is yet **a**nother **p**article **a**ccelerator **c**od**e** designed for the optimization of beam optics. It is available as Python packages and aims to provide a convenient and straightforward API to make use Python's numeros scientific libaries.
 
-## Usage
-import apace
-```python
-import apace as ap
+
+
+## Installing
+Install and update using pip:
+
+```sh
+pip install -U apace
 ```
 
-### Linear Beam Dynamics
-Import the linear beam dynamics module:
+## Dependencies
+- Python 3.7 or higher
+- CFFI 1.0.0 or higher
+- NumPy/SciPy
+- Matplotlib
+
+
+### A Simple Example
+import apace
 ```python
-from apace.linbeamdyn import LinBeamDyn
+import apace as ap
 ```
 
-Create a ring consting out of FODO cells:  
+Create a ring consisting of 8 FODO cells:
 ```python
 D1 = ap.Drift('D1', length=0.55)
 Q1 = ap.Quad('Q1', length=0.2, k1=1.2)
 B1 = ap.Bend('B1', length=1.5, angle=0.392701, e1=0.1963505, e2=0.1963505)
 Q2 = ap.Quad('Q2', length=0.4, k1=-1.2)
-fodo = ap.Line('fodo-cell', [Q1, D1, B1, D1, Q2, D1, B1, D1, Q1])
-ring = ap.Mainline('fodo-ring', [fodo] * 8)
+fodo = ap.Cell('FODO-CELL', [Q1, D1, B1, D1, Q2, D1, B1, D1, Q1])
+ring = ap.MainCell('FODO-RING', [fodo] * 8)
 ```
 
-Get twiss parameters:
+Calculate the twiss parameters:
 ```python
 twiss = ap.Twiss(ring)
 ```
 
 
-Plot twissfunctions:
+Plot horizontal and vertical beta functions using matplotlib:
 ```python
-plot(twiss.s, twiss.beta_x, twiss.beta_y, twiss.eta_x)
+plt.plot(twiss.s, twiss.beta_x, twiss.beta_y, twiss.eta_x)
 ```
+
+## License
+[GNU General Public License v3.0](https://github.com/andreasfelix/apace/blob/master/LICENSE)
+