Add profiles module docs and samples

samples/profiles_sample2.lua

@@ -0,0 +1,20 @@
+-- This script shows how to dump/restore profile without saving it to the system
+
+curr_profile = ""
+
+function on_resume()
+    ui:show_lines{
+        "Dump profile",
+        "Restore profile"
+    }
+end
+
+function on_click(idx)
+    if idx == 1 then
+        curr_profile = profiles:dump_json()
+        ui:show_toast("Saved")
+    else
+        ui:show_toast("Restoring...")
+        profiles:restore_json(curr_profile)
+    end
+end