feat: Add Option2 exercise (#290)

* added option2

* changed up the exercise, modified the help section

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

* Update exercises/option/option2.rs

Co-Authored-By: fmoko <mokou@posteo.net>

Co-authored-by: fmoko <mokou@posteo.net>

info.toml

@@ -534,6 +534,21 @@ and:
 pattern matching
 """
 
+[[exercises]]
+name = "option2"
+path = "exercises/option/option2.rs"
+mode = "compile"
+hint = """
+check out:
+https://doc.rust-lang.org/rust-by-example/flow_control/if_let.html
+https://doc.rust-lang.org/rust-by-example/flow_control/while_let.html
+
+Remember that Options can be stacked in if let and while let.
+For example: Some(Some(variable)) = variable2
+
+
+"""
+
 [[exercises]]
 name = "result1"
 path = "exercises/error_handling/result1.rs"