feat: add examples with descriptions

exl/00_variables.fzs

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+// There are two ways to work with variables
+// 1. Declare variable:
+str someString = "world, hello!";
+
+// 2. Change variable value:
+someString = "hello, world!";
+
+// Variables helps you store values to use it later
+int a = 2;
+int b = a + a * a;
+int c = a * b;
+
+printline("Now we got 12:");
+printline(c);
+
+// Also, there is many different types to help your program
+//  work with many things:
+int signedInteger;
+uint unsignedInteger
+str string;
+bool boolean;
+
+i8  integer1; // 8-byte int
+i16 integer2; // 16-byte int
+i32 integer3; // 32-byte int
+i64 integer4; // 64-byte int
+
+u8  integer5; // unsigned 8-byte integer
+u16 integer6; // unsigned 16-byte integer
+u32 integer7; // unsigned 32-byte integer
+u64 integer8; // unsigned 64-byte integer
+

exl/01_conditions.fzs

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+// When you need to check some value
+//  a conditional statements might help you
+
+int valueToCheck = 2 + 2;
+if (valueToCheck == 4)
+{
+  printline("Yay! 2 + 2 = 4");
+}
+
+// Conditional statement uses condition in pairs
+//  after `if` keyword and executes command(s) after
+//  if condition turns out to be true
+
+// Otherwise, to execute block when condition turns
+//  out to be false, you can use `else` keyword:
+
+int age = 30;
+
+if (age <= 20)
+  printline("You're too young");
+else
+{
+  age = 20;
+  printline("You looks too young!");
+}
+
+// NOTE: If you need to execute only one statement
+//  inside `if` or `else` block, then the curly
+//  braces can be omitted.
+

exl/02_functions.fzs

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+// If you have some code section which is
+//  duplicated in program several times
+//  then it means your program needs some
+//  functions!
+
+fn doSomeWork()
+{
+  printline("Some work");
+}
+
+// If the function makes some kind of
+//  calculations then you should specify
+//  the result type
+
+fn sum(int a, int b) int
+{
+  return a + b;
+}
+
+// The `return` keyword can be used to
+//  actually return the value from the
+//  function. Also, you can specify list
+//  of arguments that you will use inside
+//  the function
+
+int first = 5;
+int second = 6;
+int result = sum(first, second);
+printline(result);
+