Add readme and license

LICENSE.txt

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+MIT License
+
+Copyright (c) 2024 Christoffer Kragh Pedersen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Tenable-Exporter
+Simple Tenable exporter to get Open-Telemetry metrics of Tenable Scans and Vulnerabilities.
+
+## Usage
+Run the Docker image with the following variables:
+``` yaml
+TIO_ACCESS_KEY: 
+TIO_SECRET_KEY: 
+SECURITYCENTER_NETWORK_ADDRESS: 
+SC_USERNAME: 
+SC_PASSWORD: 
+```
+``` sh
+docker run -p 8080:<your_port> -e TIO_ACCESS_KEY=your_access_key -e TIO_SECRET_KEY=your_secret_key -e SECURITYCENTER_NETWORK_ADDRESS=your_sc_address -e SC_USERNAME=your_sc_username -e SC_PASSWORD=your_sc_password tonur/tenable-exporter
+```
+
+You need to specify either (TIO_ACCESS_KEY, TIO_SECRET_KEY, SECURITYCENTER_NETWORK_ADDRESS), (SC_USERNAME, SC_PASSWORD) or all of them to have this image do anything. In the case of only SC Environment Variables supplied, only the Scanning metrics is updated and in the case of only TIO + Network Address supplied, only the Vulnerabilities is updated.