Added files for chapter 2

2.Primitives/1-LiteralsAndOperators.rs

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+/*
+Integers 1, floats 1.2, characters 'a', strings "abc", booleans true and the unit type () can be expressed using literals.
+Integers can, alternatively, be expressed using hexadecimal, octal or binary notation using these prefixes respectively: 0x, 0o or 0b.
+*/
+
+fn main(){
+	//Integer addition
+	println!("1 + 2 = {}", 1u32 + 2);
+
+	//Integer subtraction
+	println!("1 - 2 = {}", 1i32 - 2);
+	//TODO ^ Try changing `1i32` to `1u32` to see why the type is important
+
+	//Short-circuiting boolean logic
+	println!("true AND false is {}", true && false);
+	println!("true OR false is {}", true || false);
+	println!("NOT true is {}", !true);
+
+	//Bitwise operations
+	println!("0011 AND 0101 is {:04b}", 0b0011u32 & 0b0101);
+	println!("0011 OR 0101 is {:04b}", 0b0011u32 | 0b0101);
+	println!("0011 XOR 0101 is {:04b}", 0b0011u32 ^ 0b0101);
+	println!("1 << 5 is {}", 1u32 << 5);
+	println!("0x80 >> 2 is 0x{:x}", 0x80u32 >> 2);
+
+	//Use underscores to improve readability!
+	println!("One million is written as {}", 1_000_000u32);
+}