rlp tests, the beginning

json-tests/json/rlp/README.md

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+# Rlp tests guideline
+
+Rlp can be tested in various ways. It can encode/decode a value or an array of values. Let's start with encoding.
+
+Each operation must have field:
+
+- `operation` - `append`, `append_list`, `append_empty` or `append_raw`
+
+Additionally `append` and `append_raw` must additionally define a `value` field:
+
+- `value` - data
+
+Also `append_raw` and `append_list` requires `len` field
+
+- `len` - integer
+
+### Encoding Test Example
+
+```json
+{
+	"input":
+	[
+		{
+			"operation": "append_list",
+			"len": 2
+		},
+		{
+			"operation": "append",
+			"value": "cat"
+		},
+		{
+			"operation": "append",
+			"value": "dog"
+		}
+	]
+	"output": "0xc88363617183646f67"
+}
+```
+

json-tests/json/rlp/catdog.json

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+{
+	"input":
+	[
+		{
+			"operation": "append_list",
+			"len": 2
+		},
+		{
+			"operation": "append",
+			"value": "cat"
+		},
+		{
+			"operation": "append",
+			"value": "dog"
+		}
+	]
+	"output": "0xc88363617183646f67"
+}