Added Github_Unfollowers with all changes requested

Fixed #732

Author: vismitap

.gitignore

@@ -294,4 +294,7 @@ $RECYCLE.BIN/
 
 
 # Chrome driver
-chromedriver.exe
+chromedriver.exe
+
+# for node_modules
+node_modules

JavaScript/Github_Unfollowers/Followers.json

@@ -0,0 +1 @@
+[]

JavaScript/Github_Unfollowers/Github_Unfollowers.js

@@ -0,0 +1,42 @@
+// Script to track recent unfollowers on github using github api
+// Author: vismitap
+
+const prompt = require("prompt-sync")();
+const Username = prompt("What is your Github Username? : ");
+
+// require node-fetch
+const node_fetch = require("node-fetch");
+
+//require fs for memory of old and updated data
+const fs = require("fs");
+
+let url = `https://api.github.com/users/${Username}/followers`;
+
+let current = JSON.parse(fs.readFileSync("Followers.json"));
+console.table(current);
+
+// fetch data and store in set
+node_fetch(url)
+  .then((res) => res.json())
+  .then((out) => {
+    let i = 0;
+    let set = new Set();
+    
+    // find the followers username on github from the returned json by github API
+    for (i in out) {
+      set.add(out[i]["login"]);
+    }
+
+    if (current.length == 0) {
+      console.log(`Hey ${Username}, 
+      Welcome to Github_Unfollowers!
+      On your way to know the unfollowers!
+      Run the command once again!`);
+    } else {
+      const unfollowers = current.filter((e) => !set.has(e));
+      console.log("The unfollowers are: ")
+      console.table(unfollowers);
+    }
+    fs.writeFileSync("Followers.json", JSON.stringify(Array.from(set)));
+  })
+  .catch((err) => console.log(err));

JavaScript/Github_Unfollowers/README.md

@@ -0,0 +1,18 @@
+# Github_Unfollowers
+Github_Unfollowers is a script to track the recent people who unfollowed you on Github using the Github API. 
+* It uses the github API to fetch data of followers.
+* The data is then stored in `Followers.json` file and compared with new data and hence the unfollowers can be found!
+
+# Setup instructions
+* cd to Rotten-Scripts\JavaScript\Github_unfollowers.
+* Run `npm install` to install all dependencies.
+* Check whether there is [] in `Followers.json` in the beginning.
+* Run `node Github_unfollowers.js` and unleash the magic ✨✨.
+
+# Output
+![Run First Time](https://i.imgur.com/mL87JCi.png)
+![Run Second Time](https://i.imgur.com/qdVkCRK.png)
+![Final Output](https://i.imgur.com/TF50DbH.png)
+
+# Author
+Vismita Prabhu - [@vismitap](https://github.com/vismitap)

JavaScript/Github_Unfollowers/package-lock.json

@@ -29,4 +29,5 @@ It enables interactive web pages and thus is an essential part of web applicatio
 | 16 | ROT13 | [Click Here](ROT13) | [tej5169](https://github.com/tej5169) |  
 | 17 | RSA Key Pair Generator | [Click Here](RSA_Key_Pair_Generator) | [Mohit Bhat](https://github.com/mbcse) | 
 | 18 | Send emails | [Click Here](Send_Emails) | [Namya LG](https://github.com/Namyalg) | 
-| 19 | Who don't follow you | [Click Here](Who_Don't_Follow_You) | [Harsh Barshan Mishra](https://github.com/HarshCasper) |
+| 19 | Who don't follow you | [Click Here](Who_Don't_Follow_You) | [Harsh Barshan Mishra](https://github.com/HarshCasper) |
+| 20 | Github_Unfollowers | [Click Here](Github_Unfollowers) | [Vismita Prabhu](https://github.com/vismitap) |