Merge pull request #107 from bannmann/add-calendar-category

Add calendar category & ChronoLink service

Author: wdhdev

data/Calendar.md

@@ -0,0 +1,8 @@
+## Calendar
+
+| Website | Description |
+|:-:|-|
+| [ChronoLink](https://www.chronolink.app) | Flexibly synchronize calendars, create rules for selecting and transforming events. The free plan is restricted to one sync connection. |
+| [Gmail](https://gmail.com) | Free personal email and calendar. |
+| [Outlook](https://outlook.com) | Free personal email and calendar. |
+| [Tutanota](https://tutanota.com) | An email service that prioritizes privacy. The free plan has restrictions such as a maximum of 1gb of storage, 1 calendar per account, and only 1 email per account with a 48 hour verification period to prevent abuse. |

data/_start.md

@@ -14,6 +14,7 @@ A massive list including a huge amount of products and services that are complet
 - [APIs, Data & ML](#apis-data-and-ml)
 - [Artificial Intelligence](#artificial-intelligence)
 - [BaaS](#baas)
+- [Calendar](#calendar)
 - [Code Editors](#code-editors)
 - [Code Generation](#code-generation)
 - [Courses](#courses)