add makeId.js

CONTRIBUTING.md

@@ -20,4 +20,5 @@
 - Reysekha
 - igrzhukovich
 - CinnamonXI
-- AkasakaID
+- AkasakaID
+- JastinXyz

src/Javascript/makeId.js

@@ -0,0 +1,11 @@
+const string = "ABCDEFGHIJKLMNOPQRSTUVFXYZabcdefghijklmnopqrstuvwxyz1234567890"
+function makeId(number = 8) {
+    let result = "";
+    const charlength = string.length;
+    for(let i = 0; i < number; i++) {
+        result += string.charAt(Math.floor(Math.random() * charlength));
+    }
+    return result;
+}
+
+console.log(makeId(10))