Add profiles module docs and samples

samples/profiles_sample1.lua

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+-- This sample lists current system profiles and allows to restore any of it
+
+profs = {}
+
+function on_resume()
+    profs = profiles:list()
+    ui:show_lines(profiles:list())
+end
+
+function on_click(idx)
+    ui:show_toast("Restoring...")
+    profiles:restore(profs[idx])
+end

samples/profiles_sample2.lua

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+-- 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