add curated clightning plugins

modules/clightning-plugins/summary.nix

@@ -0,0 +1,39 @@
+{ config, lib, ... }:
+
+with lib;
+let cfg = config.services.clightning.plugins.summary; in
+{
+  options.services.clightning.plugins.summary = {
+    enable = mkEnableOption "Summary (clightning plugin)";
+    currency = mkOption {
+      type = types.str;
+      default = "USD";
+      description = "The currency to look up on btcaverage.";
+    };
+    currencyPrefix = mkOption {
+      type = types.str;
+      default = "USD $";
+      description = "The prefix to use for the currency.";
+    };
+    availabilityInterval = mkOption {
+      type = types.int;
+      default = 300;
+      description = "How often in seconds the availability should be calculated.";
+    };
+    availabilityWindow = mkOption {
+      type = types.int;
+      default = 72;
+      description = "How many hours the availability should be averaged over.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.clightning.extraConfig = ''
+      plugin=${config.nix-bitcoin.pkgs.clightning-plugins.summary.path}
+      summary-currency="${cfg.currency}"
+      summary-currency-prefix="${cfg.currencyPrefix}"
+      summary-availability-interval=${toString cfg.availabilityInterval}
+      summary-availability-window=${toString cfg.availabilityWindow}
+    '';
+  };
+}