Add files demoing fetch API and promises

week1/day3/fetchdemo.js

@@ -0,0 +1,10 @@
+let fetchRes = fetch("https://jsonplaceholder.typicode.com/posts/1");
+
+fetchRes.then(res=>
+    res.json()).then(
+        data=>{
+            console.log(data)
+        }
+    ).catch((error)=>{
+        console.log(error);
+    })

week1/day3/promisedemo.js

@@ -0,0 +1,12 @@
+const getSomething = () => {
+    return new Promise((resolve, reject) => {
+        //resolve("some data");
+        reject("some error");
+    })
+}
+
+getSomething().then(data=>{
+    console.log(data)
+}).catch(err=>{
+    console.log(err)
+})