Add Docker support and documentation updates

- Add Dockerfile for containerized builds
- Add .dockerignore for cleaner builds
- Add CLAUDE.md for development guidance
- Update README and docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

tests/diagram.puml

@@ -0,0 +1,10 @@
+@startuml
+start
+:Set a = 5;
+:Set b = 6;
+:Set c = 7;
+:Calculate semi-perimeter s = (a + b + c) / 2;
+:Calculate area = sqrt(s*(s-a)*(s-b)*(s-c));
+:Print "The area of the triangle is [area]";
+stop
+@enduml

tests/test.py

@@ -0,0 +1,17 @@
+# Python Program to find the area of triangle
+
+a = 5
+b = 6
+c = 7
+
+# Uncomment below to take inputs from the user
+# a = float(input('Enter first side: '))
+# b = float(input('Enter second side: '))
+# c = float(input('Enter third side: '))
+
+# calculate the semi-perimeter
+s = (a + b + c) / 2
+
+# calculate the area
+area = (s*(s-a)*(s-b)*(s-c)) ** 0.5
+print('The area of the triangle is %0.2f' %area)