✨ Add Todoist node docs

docs/nodes/nodes-library/nodes/Todoist/README.md

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+---
+permalink: /nodes/n8n-nodes-base.todoist
+---
+
+# Todoist
+
+[Todoist](https://todoist.com/)  is a task management software that can be used for small teams, individuals and professionals to manage anything from a shopping list to major projects at work.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/Todoist/README.md).
+:::
+
+## Basic Operations
+
+- Task
+    - Create a new task
+
+
+## Example Usage
+
+This workflow allows you to create a new task in Todoist. You can also find the [workflow](https://n8n.io/workflows/481) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Todoist]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Todoist node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Todoist node
+
+1. First of all, you'll have to enter credentials for the Todoist node. You can find out how to do that [here](../../../credentials/Todoist/README.md).
+2. Select your project from the *Project* dropdown list.
+3. Enter the content for the task in the *Content* field.
+4. Click on *Execute Node* to run the workflow.