Added Linear Search (#20)

Added algorithm for the basic and useful linear search

src/algorithms/search/linear-search/Readme.md

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+#Linear Search
+In computer science, linear search or sequential search is a method for finding a target value within a list. It sequentially checks each element of the list for the target value until a match is found or until all the elements have been searched.
+Linear search runs in at worst linear time and makes at most n comparisons, where n is the length of the list. 
+
+##References-
+-[Wikipedia] https://en.wikipedia.org/wiki/Linear_search
+-[Youtube] https://www.youtube.com/watch?v=SGU9duLE30w

src/algorithms/search/linear-search/linearsearch.js

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+function linearSearch(array, Find){
+  for(let i = 0; i < array.length; i++){
+    if(array[i] === Find) return i;
+    
+  }
+   return -1;
+}