Add Apprise notification adapter (#92)

lib/notification/adapter/apprise.js

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+import { markdown2Html } from '../../services/markdown.js';
+import { getJob } from '../../services/storage/jobStorage.js';
+import fetch from 'node-fetch';
+
+export const send = ({ serviceName, newListings, notificationConfig, jobKey }) => {
+  const { priority, server } = notificationConfig.find((adapter) => adapter.id === config.id).fields;
+  const job = getJob(jobKey);
+  const jobName = job == null ? jobKey : job.name;
+  const promises = newListings.map((newListing) => {
+    const message = `Address: ${newListing.address}\nSize: ${newListing.size}\nPrice: ${newListing.price}\nURL: ${newListing.link}`;
+    return fetch(server, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        body: message,
+        title: newListing.title,
+      }),
+    });
+  });
+
+  return Promise.all(promises);
+};
+export const config = {
+  id: 'apprise',
+  name: 'Apprise',
+  readme: markdown2Html('lib/notification/adapter/apprise.md'),
+  description: 'Fredy will send new listings to your Apprise instance.',
+  fields: {
+    priority: {
+      type: 'number',
+      label: 'Priority',
+      description: 'The priority of the send notification.',
+    },
+    server: {
+      type: 'text',
+      label: 'Server',
+      description: 'The server url to send the notification to.',
+    },
+  },
+};

lib/notification/adapter/apprise.md

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+### Apprise Adapter
+
+Refer to the [instructions](https://github.com/caronc/apprise-api#installation) on how to set up an Apprise instance and how to configure your preferred notification service.
+
+In addition to the Apprise instance, the priority must be defined.