Link to help on provider/agency IDs

Author: schnuerle

README.md

@@ -133,7 +133,7 @@ More than 115 cities and public agencies around the world use MDS, and it has be
 
 Please let us know [via our website](https://www.openmobilityfoundation.org/get-in-touch/) or in the [public discussion area](https://github.com/openmobilityfoundation/mobility-data-specification/discussions) if you are an agency using MDS so we can add you to the city resource list, especially if you have published your policies or documents publicly.
 
-To add yourself to the [agency list](/agencies.csv) and add your [Policy Requirement link](/provider.md#requirements), please let us know [via our website](https://www.openmobilityfoundation.org/get-in-touch/) or open an [Issue](https://github.com/openmobilityfoundation/mobility-data-specification/issues) or [Pull Request](https://github.com/openmobilityfoundation/mobility-data-specification/pulls). 
+To add yourself to the [agency list](/agencies.csv) and add your [Policy Requirement link](/provider.md#requirements), please let us know [via our website](https://www.openmobilityfoundation.org/get-in-touch/) or open an [Issue](https://github.com/openmobilityfoundation/mobility-data-specification/issues) or [Pull Request](https://github.com/openmobilityfoundation/mobility-data-specification/pulls). Find out how in our [Adding an Agency ID](https://github.com/openmobilityfoundation/mobility-data-specification/wiki/Adding-an-MDS-Agency-ID) help document.
 
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@@ -143,7 +143,7 @@ Over two dozen mobility service providers (MSPs) around the world use MDS, allow
 
 - See our **[list of providers using MDS](https://www.openmobilityfoundation.org/mds-users/#mobility-providers-using-mds)**. For a table list with unique IDs, see the MDS [provider list](/providers.csv).
 
-To add yourself to the provider list, please let us know [via our website](https://www.openmobilityfoundation.org/get-in-touch/) or open an [Issue](https://github.com/openmobilityfoundation/mobility-data-specification/issues) or [Pull Request](https://github.com/openmobilityfoundation/mobility-data-specification/pulls).
+To add yourself to the provider list, please let us know [via our website](https://www.openmobilityfoundation.org/get-in-touch/) or open an [Issue](https://github.com/openmobilityfoundation/mobility-data-specification/issues) or [Pull Request](https://github.com/openmobilityfoundation/mobility-data-specification/pulls). Find out how in our [Adding an Provider ID](https://github.com/openmobilityfoundation/mobility-data-specification/wiki/Adding-an-MDS-Provider-ID) help document.
 
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