some language docs

docs/02_Ifelse.md

@@ -0,0 +1,58 @@
+# If-Else statement
+An if-else statement lets you specify which portions to code the interpreter must run based on the result of an expression.
+
+The syntax of an if-else statement is the following:
+```py
+if condition: {
+    # Executed when the condition is true
+} else {
+    # Executed when the condition is false
+}
+```
+
+The condition may be any type of expression, but must evaluate to a boolean type. No implicit casts are performed. 
+
+When the `else` block is empty, in can me omitted:
+```py
+if condition: {
+    # Executed when the condition is true
+}
+```
+
+If the blocks only contain one statement, it's possible to omit the curly brackets:
+```py
+if condition:
+    doSomething();
+else
+    doSomethingElse();
+```
+
+## If-else chains
+Since curly brackets can be dropped for blocks with only one statement, the following code:
+```py
+if cond0: {
+    doSomething();
+} else {
+    if cond1: {
+        doSomethingElse();
+    } else {
+        doSomethingDumb();
+    }
+}
+```
+can be simplified to
+```py
+if cond0: {
+    doSomething();
+} else if cond1: {
+    doSomethingElse();
+} else {
+    doSomethingDumb();
+}
+```
+creating a chain of if-else statements.
+
+## Compound statements
+Actually the meaning of the curly brackets is to group multiple statements into one.
+
+The if-else statement expects only one statement for each branch, though it's possible to provide more than one statement each by wrapping them into curly brackets.