Directory Restructure (#1163)

* Move tests -> testing

* Directory restructure

* Update Cargo.toml during restructure

* Update Makefile during restructure

* Fix arbitrary path

testing/state_transition_vectors/README.md

@@ -0,0 +1,72 @@
+# state_transition_vectors
+
+This crate contains test vectors for Lighthouse state transition functions.
+
+This crate serves two purposes:
+
+- Outputting the test vectors to disk via `make`.
+- Running the vectors against our code via `make test`.
+
+
+## Outputting vectors to disk
+
+Whilst we don't actually need to write the vectors to disk to test them, we
+provide this functionality so we can generate corpra for the fuzzer and also so
+they can be of use to other clients.
+
+To create the files in `./vectors` (directory relative to this crate), run:
+
+```bash
+make
+```
+
+This will produce a directory structure that looks roughly like this:
+
+```
+vectors
+└── exit
+    ├── invalid_bad_signature
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_duplicate
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_exit_already_initiated
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_future_exit_epoch
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_not_active_after_exit_epoch
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_not_active_before_activation_epoch
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_too_young_by_a_lot
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_too_young_by_one_epoch
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── invalid_validator_unknown
+    │   ├── block.ssz
+    │   ├── error.txt
+    │   └── pre.ssz
+    ├── valid_genesis_epoch
+    │   ├── block.ssz
+    │   ├── post.ssz
+    │   └── pre.ssz
+    └── valid_previous_epoch
+        ├── block.ssz
+        ├── post.ssz
+        └── pre.ssz
+```