fix submodule, add instructions

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "logos"]
+	path = logos
+	url = https://github.com/NX211/homer-icons.git

README.md

@@ -3,3 +3,10 @@
 Single file dashboard for applications
 
 Displays load time of the dashboard and uptime of applications.
+
+```
+https://git.myco.systems/mycosystems/singlefiledash.git
+```
+```
+git submodule update --init --recursive
+```