update readme with extensions

Author: ved-rivos

README.md

@@ -16,6 +16,7 @@ Spike supports the following RISC-V ISA features:
   - Zicntr extension, v2.0
   - M extension, v2.0
   - A extension, v2.1
+  - B extension, v1.0
   - F extension, v2.2
   - D extension, v2.2
   - Q extension, v2.2
@@ -38,11 +39,21 @@ Spike supports the following RISC-V ISA features:
   - Svnapot extension, v1.0
   - Svpbmt extension, v1.0
   - Svinval extension, v1.0
+  - Svadu extension, v1.0
   - Sdext extension, v1.0-STABLE
   - Sdtrig extension, v1.0-STABLE
   - Smepmp extension v1.0
   - Smstateen extension, v1.0
   - Sscofpmf v0.5.2
+  - Ssdbltrp extension, v1.0
+  - Ssqosid extension, v1.0
+  - Zaamo extension, v1.0
+  - Zalrsc extension, v1.0
+  - Zabha extension, v1.0
+  - Zacas extension, v1.0
+  - Zawrs extension, v1.0
+  - Zicfiss extension, v1.0
+  - Zicfilp extension, v1.0
   - Zca extension, v1.0
   - Zcb extension, v1.0
   - Zcf extension, v1.0