PR - Find Max implementation (#114)

* ruby implementation navigation added

* find max implementation

* review comments implementation

* file name changed

* review comments implemented

Author: msaf9

en/Basic Math/Find the maximum number.md

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+# Find (Maximum) 
+
+Find the maximum number from a list of given numbers.
+
+## Applications
+
+By finding the maximum number in a list, we can perform many operations based on this.
+
+Uses:
+
+- Sort our records based on the largest value.
+- Makes our process of finding a particular item easy.
+- If we are able to find out and sort our records based on 
+  largest value then we can sort or find our records according 
+  to particular index or element with ease.
+
+## Steps
+
+The maximum number from an array can be found by various ways. 
+Here, we will see three different ways of finding the largest 
+number.
+
+1. By comparing all the elements of an array.
+2. By using predefined methods.
+3. By sorting.
+
+## Example 1
+
+By comparing all the elements of an array:
+
+Given the list `[6, 4, 50, 8, 70, 2, 20]`, let's find the maximum number.
+
+### Step 1
+
+Provide `[6, 4, 50, 8, 70, 2, 20]` as input for a method or function.
+
+### Step 2
+
+By using the comparsion process, we are going to find the largest number.
+Set the the index element of an array as maximum number.
+max = array[0]
+`max = 6` 
+
+### Step 3
+
+Looping the entire array of elements and compare each element with max.
+If a given number is bigger than the max, then we make this particular number as max.
+Consider one of the iterations, which happens between 6 and 50.
+`max = 50`
+
+End of the entire loop.
+`max = 70`
+
+### Step 4
+
+Return the value 70.
+
+## Example 2
+
+By predefined max method:
+
+Given the list `[6, 4, 50, 8, 70, 2, 20]`, let's find the maximum number.
+
+### Step 1
+
+Provide `[6, 4, 50, 8, 70, 2, 20]` as input for a method/ function.
+
+### Step 2
+
+The predefined max method, find the maximum element.
+`70`
+
+### Step 3
+
+Return the value 70.
+
+## Example 3
+
+By sorting:
+
+Given the list `[6, 4, 50, 8, 70, 2, 20]`, let's find the maximum number.
+
+### Step 1
+
+Provide `[6, 4, 50, 8, 70, 2, 20]` as input for a method/ function.
+
+### Step 2
+
+The predefined sort method, sorts the entire array in ascending (small to big) order.
+`[2, 4, 6, 8, 20, 50, 70]`
+
+### Step 3
+
+Get the last value out of the list by using predefined last method.
+`70`
+
+### Step 4
+
+Return the value 70.
+
+## Implementation
+
+- [Ruby](https://github.com/TheAlgorithms/Ruby/blob/master/maths/find_max.rb)
+
+# Source
+
+- [GeeksForGeeks](https://www.geeksforgeeks.org/c-program-find-largest-element-array/)
+
+# YouTube
+
+- [YouTube URL video](https://youtu.be/En68ipRaFOU)