Add isa1

isa1.py

@@ -0,0 +1,25 @@
+class field:
+    len: int = 0
+    bits: int = 0
+
+
+class instruction:
+    name: str = ""
+    extention: str = ""
+    fields: list[field] = []
+
+
+class rv64i(instruction):
+    pass
+
+
+class sync(instruction):
+    pass
+
+
+class vector(instruction):
+    pass
+
+
+class dma(instruction):
+    pass