Merge pull request 4GeeksAcademy#6 from alesanchezr/master

Added video solutions for all exercises

Author: alesanchezr

exercises/03-What-is-a-function/README.md

@@ -1,3 +1,7 @@
+---
+tutorial: "https://www.youtube.com/watch?v=tgTLyZ0cKj4"
+---
+
 # `03` What is a function?
 
 You can see a function as a **fragment of code** we can use  several times.

exercises/04-Call-a-function/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=NU5iW_bWwmY"
+---
+
 # `04` Calling a function  
 
 A function could receive 0 parameters, and you can it always returns something, event if you don't explicitly add the `return` statement.

exercises/05-Defining-vs-Calling-a-function/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=fz4ttmwZWuc"
+---
+
 # `05` Defining vs Calling a function
 
 Functions will only exists if you or somebody else defines them... is the only way the language compiler/interpreter knows they exist, therefore is able to run them when you call them.

exercises/06-lambda-functions/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=HACQ9uerCuE"
+---
+
+
 # `06` Lambda functions in Python
 
 A lambda function is a function with just one line of code and no name.
@@ -31,4 +36,4 @@ Here is how you would declare it like a normal function
 def is_odd(num):
     return (num % 2) == 0:
 ```
- 
+ 

exercises/07-lambda-function-two/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=1HwmTkQPeMo"
+---
+
 # `07` Lambda functions
 
 Take aim and note

exercises/08-Function-that-returns/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=-tqNmngh1PE"
+---
+
 # `08` Functions that return
 
 
@@ -16,4 +20,4 @@ Using the two functions available, print on the console the value of 137 dollars
 Working backwards:
 - Our expected value is in yen. 
 - Our available function euro_to_yen will provide that
-- To get to euro we will use the available function dollar_to_euro.
+- To get to euro we will use the available function dollar_to_euro.

exercises/09-Function-parameters/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=uaiDxW4LJNA"
+---
+
 # `09` Function parameters
 
 You can specify as many parameters as you want in a function. As a developer you are going to find functions with even 6 or 7 parameters  all the time. The names of the parameters don't matter, but you have to be as explicit as you can because these names will give clues to the other developers (or yourself in the future) about what is each parameter about.

exercises/10-Array-Methods/README.md

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+---
+tutorial: "https://www.youtube.com/watch?v=jBXve_vh7dU"
+---
+
+
 # `10` List Methods
+
 # 📝 Instructions:
 Write a function called sort_names that, given a list of names, returns them in alphabetical order.
 
@@ -7,4 +13,4 @@ Every array comes with default functions that allows sorting- use it inside your
 
 Stuck on sorting? Read W3 Schools page on sorting lists:
 
-https://www.w3schools.com/python/ref_list_sort.asp
+https://www.w3schools.com/python/ref_list_sort.asp