feat: add ggplot style file and third-party license information

Author: c0rychu

LICENSE

@@ -19,3 +19,14 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+
+---
+
+
+### Third-Party Licenses
+
+This project includes or adapts files from the Matplotlib project
+(https://matplotlib.org/), licensed under the Matplotlib License Agreement
+(BSD-compatible).  
+Copyright (c) 2012– Matplotlib Development Team.

src/physics_plot/colors/ggplot.mplstyle

@@ -0,0 +1,15 @@
+# Taken from https://github.com/matplotlib/matplotlib/blob/v3.10.7/lib/matplotlib/mpl-data/stylelib/ggplot.mplstyle
+# 
+# This style file is adapted from Matplotlib’s "ggplot.mplstyle"
+# (https://github.com/matplotlib/matplotlib)
+# Copyright (c) 2012– Matplotlib Development Team.
+# Licensed under the Matplotlib License Agreement (BSD-compatible).
+
+axes.prop_cycle: cycler('color', ['E24A33', '348ABD', '988ED5', '777777', 'FBC15E', '8EBA42', 'FFB5B8'])
+                   # E24A33 : red
+                   # 348ABD : blue
+                   # 988ED5 : purple
+                   # 777777 : gray
+                   # FBC15E : yellow
+                   # 8EBA42 : green
+                   # FFB5B8 : pink