Merge pull request #182 from texei/externalcredentials-principals-authenticationparameters-add

Added "sf texei externalcredentials principals authenticationparameters add" command

Author: FabienTaillon

messages/externalcredentials.principals.authenticationparameters.add.md

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+# summary
+
+add Authentication Parameters to existing an External Credential
+
+# description
+
+This commands will add Authentication Parameters to an existing External Credential and related Principal.
+Both External Credential and Principal definition can be part of your metadata, for security reasons Authentication Parameters are not.
+The expected format of the input JSON file is the same as the one expected by the REST API:
+https://developer.salesforce.com/docs/atlas.en-us.chatterapi.meta/chatterapi/connect_requests_credential_input.htm
+Best practice is to avoid commiting this file to your repository.
+
+# examples
+
+sf texei externalcredentials principals authenticationparameters add --file ./env/credentials.json --target-org MyScratchOrg
+
+# flags.file.summary
+
+file containing information of Authentication Parameters to add