[varint] Add doc.odin

core/encoding/varint/doc.odin

@@ -0,0 +1,27 @@
+/*
+	Implementation of the LEB128 variable integer encoding as used by DWARF encoding and DEX files, among others.
+
+	Author of this Odin package: Jeroen van Rijn
+
+	Example:
+		```odin
+		import "core:encoding/varint"
+		import "core:fmt"
+
+		main :: proc() {
+			buf: [varint.LEB128_MAX_BYTES]u8
+
+			value := u128(42)
+
+			encode_size, encode_err := varint.encode_uleb128(buf[:], value)
+			assert(encode_size == 1 && encode_err == .None)
+
+			fmt.println(buf[:encode_size])
+
+			decoded_val, decode_size, decode_err := varint.decode_uleb128(buf[:encode_size])
+			assert(decoded_val == value && decode_size == encode_size && decode_err == .None)
+		}
+		```
+
+*/
+package varint