Added covid-19 example app and Updated the readme (#73)

covid19_mobile_app/lib/resources/fetch_data_functions.dart

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+import 'dart:convert';
+import 'package:http/http.dart' as http;
+
+// function to fetch global Corona Virus(all countries together)
+// to fetch data of a particular country(in this case, India)
+Future getAllData() async {
+  try {
+    var allCountriesUrl = 'https://corona.lmao.ninja/v2/all';
+    var allCountriesResponse = await http.get(allCountriesUrl);
+
+    var particularCountryUrl = 'https://corona.lmao.ninja/v2/historical/India';
+    var particularCountryResponse = await http.get(particularCountryUrl);
+
+    // a list to store the data points
+    List<Map<String, dynamic>> dataPoints = [];
+    jsonDecode(particularCountryResponse.body)['timeline']['cases']
+        .forEach((k, v) {
+      List a = k.split('/');
+      DateTime b = DateTime(int.parse(a[2]), int.parse(a[0]), int.parse(a[1]));
+      dataPoints.add({"date": b, "value": v});
+    });
+    List<Map<String, dynamic>> dataPoints1 = [];
+    jsonDecode(particularCountryResponse.body)['timeline']['deaths']
+        .forEach((k, v) {
+      List a = k.split('/');
+      DateTime b = DateTime(int.parse(a[2]), int.parse(a[0]), int.parse(a[1]));
+      dataPoints1.add({"date": b, "value": v});
+    });
+    List<Map<String, dynamic>> dataPoints2 = [];
+    jsonDecode(particularCountryResponse.body)['timeline']['recovered']
+        .forEach((k, v) {
+      List a = k.split('/');
+      DateTime b = DateTime(int.parse(a[2]), int.parse(a[0]), int.parse(a[1]));
+      dataPoints2.add({"date": b, "value": v});
+    });
+    return {
+      "all": allCountriesResponse.body,
+      "country": dataPoints,
+      "deaths": dataPoints1,
+      "recovered": dataPoints2
+    };
+  } catch (e) {
+    print(e);
+  }
+}
+
+// function to fetch data of all countries(country wise)
+Future getAllCountriesData() async {
+  try {
+    var url = 'https://corona.lmao.ninja/v2/countries?sort=country';
+    var response = await http.get(url);
+    return response.body;
+  } catch (e) {
+    print(e);
+  }
+}