Make an executable (#13)

Co-authored-by: Clement Desmidt <clement@desmidt.fr>
Reviewed-on: #13

.gitignore

@@ -1,4 +1,8 @@
 demo.py
 first.py
 theme.py
-/.idea
+/.idea
+/dist/
+!/dist/drawingtraining
+/*.spec
+/build/

makefile

@@ -0,0 +1,2 @@
+build:
+	pyinstaller main.py --onefile -w --hidden-import="PIL._tkinter_finder" -n drawingtraining

requirements.txt

@@ -1,3 +1,2 @@
-dearpygui
-pathlib
-pillow
+pillow
+pyinstaller