add snippet primes

snippet-template.md

@@ -8,4 +8,4 @@ Explain briefly how the snippet works.
 const functionName = arguments =>
   {functionBody}
 // functionName(sampleInput) -> sampleOutput
-```
+```

snippets/primes.md

@@ -0,0 +1,15 @@
+### primes 
+
+It generates primes till a given number ```m
+
+Explain briefly how the snippet works.
+
+```js
+const primes = num =>{
+  var arr =  Array.from({length:num-1}).map((x,i)=> i+2);
+  var sqroot  = Math.floor(Math.sqrt(num));
+  var numsTillSqroot  = Array.from({length:numb-1}).map((x,i)=> i+2);
+  arra.forEach(x => arr = arr.filter(y => ((y%x)!==0)||(y== x)));
+  return arr; 
+}// primes(10) -> [2,3,5,7] 
+```