Update SUMMARY.md

SUMMARY.md

@@ -5,8 +5,9 @@
     * [First steps in the kernel setup code](Booting/linux-bootstrap-2.md)
     * [Video mode initialization and transition to protected mode](Booting/linux-bootstrap-3.md)
     * [Transition to 64-bit mode](Booting/linux-bootstrap-4.md)
-    * [Kernel decompression]()
-    * [First steps inside the kernel]()
+    * [Kernel decompression](Booting/linux-bootstrap-5.md)
+* [Initialization](Initialization/README.md)
+    * [First steps in kernel]()
 * [Theory]()
     * [Paging]()
     * [Elf64](Theory/ELF.md)