Add documentation

Signed-off-by: erikbaranowski <39704712+erikbaranowski@users.noreply.github.com>

config/configtls/README.md

@@ -18,14 +18,18 @@ As a result, the following parameters are also required:
 
 - `cert_file`: Path to the TLS cert to use for TLS required connections. Should
   only be used if `insecure` is set to false.
+  - `cert_pem`: Alternative to `cert_file`. Provide the certificate contents as a string instead of a filepath.
+
 - `key_file`: Path to the TLS key to use for TLS required connections. Should
   only be used if `insecure` is set to false.
+  - `key_pem`: Alternative to `key_file`. Provide the key contents as a string instead of a filepath.
 
 A certificate authority may also need to be defined:
 
 - `ca_file`: Path to the CA cert. For a client this verifies the server
   certificate. For a server this verifies client certificates. If empty uses
   system root CA. Should only be used if `insecure` is set to false.
+  - `ca_pem`: Alternative to `ca_file`. Provide the CA cert contents as a string instead of a filepath.
 
 Additionally you can configure TLS to be enabled but skip verifying the server's
 certificate chain. This cannot be combined with `insecure` since `insecure`