README.md: Add build instructions

Let's add the build instructions to the README.md. Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
XUANTIE-RV · Aug 25, 2022 · d4fedea · d4fedea
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Showing 1 changed file with 13 additions and 2 deletions.
diff --git a/README.md b/README.md
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-# thead-extension-spec
-T-head vendor extension Instruction Set spec
+# T-Head ISA extensions (Xthead*)
+
+This repository contains the T-Head RISC-V ISA extensions (Xthead*) specifications.
+
+## Build instructions
+
+The specification is written in AsciiDoc.
+The following instructions can be used to generate a PDF containing
+all specifications:
+
+```
+make
+```