Add admin balance command

src/commands/admin/adminbalance.js

@@ -0,0 +1,29 @@
+const Command = require('../../structures/Command');
+
+module.exports = class AdminBalance extends Command {
+  get name() { return 'adminbalance'; }
+
+  get _options() { return {
+    aliases: ['abal', 'adminbal'],
+    permissions: ['admin']
+  }; }
+
+  async exec(message) {
+    const response = await this.client.lbry.walletBalance();
+    if (response.status !== 200) {
+      console.error('SDK error in adminbalance', response, await response.text());
+      return message.channel.createMessage(`LBRY-SDK returned ${response.status}, check console.`);
+    }
+    const wallet = await response.json();
+    return message.channel.createMessage({ embed: {
+      description: `**Available:** ${wallet.result.available} LBC\n\n` +
+        `Reserved in Supports: ${wallet.result.reserved_subtotals.supports} LBC\n` +
+        `Total: ${wallet.result.total} LBC`
+    } });
+  }
+
+  get metadata() { return {
+    category: 'Admin',
+    description: 'Shows the master wallet balance.'
+  }; }
+};