Create README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

python_basics/if/README.md

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+# Flow Control if, elif, else
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## The goal
+
+If I would have... 
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+**Logic blocks need to be indented.​ Preferable with 4 spaces!**
+
+## [The if statement](https://docs.python.org/3/reference/compound_stmts.html#the-if-statement)
+
+```python
+if i == 1:​
+    print("if")​
+elif i == 2:​
+    print("elif brach A")​
+elif i == 3:​
+    print("elif brach B")​
+else:​
+    print("else -- default")​
+```
+
+## The full statement
+
+```python
+if_stmt ::=  "if" assignment_expression ":" suite
+             ("elif" assignment_expression ":" suite)*
+             ["else" ":" suite]
+```
+