Inline introduction.adoc

Having it in a separate file confuses VSCode's Asciidoc support a bit because the heading sequence isn't correct - it goes H1->H3. I think it's also less confusing for humans this way, because only the first part of the introduction was in the introduction.adoc, and it hardly seems worth having a separate file for one paragraph.

Author: Timmmm

introduction.adoc

@@ -54,8 +54,20 @@ include::changelog.adoc[]
 include::licensing.adoc[]
 // Contributors of this document
 include::contributor.adoc[]
-// introduction of this document
-include::introduction.adoc[]
+
+== Introduction
+
+This specification delineates the operation parameters according the general PLIC
+architecture defined in the RISC-V platform-level interrupt controller (PLIC)
+specification (was removed from https://github.com/riscv/riscv-isa-manual/releases/download/draft-20181201-5449851/riscv-privileged.pdf[RISC-V Privileged Spec v1.11-draft])
+to work in the context of RISC-V systems. +
+The PLIC multiplexes various device interrupts onto the external interrupt lines
+of Hart contexts, with hardware support for interrupt priorities. PLIC supports
+up-to 1023 interrupts (0 is reserved) and 15872 contexts, but the actual number of
+interrupts and context depends on the PLIC implementation. However, the implementation
+must adhere to the offset of each register within the PLIC operation parameters.
+The PLIC which claimed as PLIC-Compliant standard PLIC should follow the
+implementations mentioned in sections below.
 
 === Interrupt Targets and Hart Contexts