oauth2c: add page

pages/common/oauth2c.md

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+# oauth2c
+
+> Interact with OAuth 2.0 authorization servers.
+> More information: <https://github.com/cloudentity/oauth2c#usage>.
+
+- Fetch an access token using client credentials:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --client-secret {{client_secret}}`
+
+- Fetch a token using authorization code flow:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --response-types code`
+
+- Fetch a token using authorization code with PKCE:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --pkce`
+
+- Fetch a token using password credentials:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --username {{username}} --password {{password}}`
+
+- Refresh an existing access token:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --refresh-token {{refresh_token}}`
+
+- Fetch a token with specific scopes:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --scopes {{scope1,scope2}}`
+
+- Use device authorization flow:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} --grant-type device_code`
+
+- Run in silent mode without browser:
+
+`oauth2c {{issuer_url}} --client-id {{client_id}} {{[-s|--silent]}} --no-browser`