Add instructions for custom asset

apps/client/src/app/pages/faq/self-hosting/self-hosting-page.html

@@ -118,6 +118,25 @@
           providers are considered experimental.</mat-card-content
         >
       </mat-card>
+      <mat-card appearance="outlined" class="mb-3">
+        <mat-card-header>
+          <mat-card-title>How do I add a custom asset?</mat-card-title>
+        </mat-card-header>
+        <mat-card-content>
+          <p>
+            If you want to track an asset that is not available from any data
+            provider, you can create a custom asset as follows.
+          </p>
+          <ol>
+            <li>Go to the <i>Admin Control</i> panel</li>
+            <li>Go to the <i>Market Data</i> section</li>
+            <li>Create an asset profile</li>
+            <li>Select <i>Add Manually</i> and enter a unique symbol</li>
+            <li>Edit your asset profile</li>
+            <li>Add a new activity by searching for the symbol</li>
+          </ol>
+        </mat-card-content>
+      </mat-card>
       <mat-card appearance="outlined" class="mb-3">
         <mat-card-header>
           <mat-card-title>Which devices are supported?</mat-card-title>