Added Linear Search (trekhleb#20)

Added algorithm for the basic and useful linear search

Author: ak4522912

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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+functionlinearSearch(array,Find){
+for(leti=0;i<array.length;i++){
+if(array[i]===Find)returni;
+
+}
+return-1;
+}