Add README; fixes #3

Author: mackensen

README.md

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+# LTI Tools API
+
+![Moodle Plugin CI](https://github.com/CLAMP-IT/lti_tools_api/workflows/Moodle%20Plugin%20CI/badge.svg)
+
+This local module provides a suite of web services for working with LTI tools on a Moodle installation. These web services are grouped in the "LTI Tools API" external service.
+
+## Configuration
+
+To use this service you will need the following:
+
+1. A user with sufficient permissions to use the web services
+2. A token for that user
+
+See [Using web services](https://docs.moodle.org/501/en/Using_web_services) in the Moodle documentation for information about creating and enabling web services. The user will need the following capabilities in addition to whichever protocol you enable:
+
+- `mod/lti:addinstance`
+- `moodle/course:manageactivities`
+
+## Functions
+
+The LTI Tools API external service includes five functions:
+
+- **local_lti_tools_api_add_lti_instance**: Add an LTI tool instance to a course
+- **local_lti_tools_api_get_lti_tool_by_name**: Get LTI tool type ID by name
+- **local_lti_tools_api_get_lti_tool_details**: Get detailed information about a specific LTI tool
+- **local_lti_tools_api_get_lti_tools**: Get available LTI tools
+- **local_lti_tools_api_set_lti_availability**: 	
+Set or update availability restrictions for an existing LTI instance
+
+## Requirements
+
+- Moodle 4.1 (build 2022112800 or later)
+
+## Installation
+
+Copy the lti_tools_api folder into your /local directory and visit your Admin Notification page to complete the installation.
+
+## Author
+
+Daniel Landau ()