add audit doc

audit_doc.md

@@ -0,0 +1,33 @@
+1) general overview, auth, util, data  40%
+2) token, multisig  50%
+3) deploy sequence  10%
+
+Part 1: Simple Contracts
+---
+#### `actor`
+##### `actor/base.sol`
+##### `actor/base_actor.sol`
+##### `actor/base_actor_test.sol`
+
+#### `auth`
+##### `auth/auth.sol`
+##### `auth/auth_test.sol`
+##### `auth/authority.sol`
+##### `auth/authorized.sol`
+##### `auth/basic_authority.sol`
+##### `auth/basic_authority_test.sol`
+##### `auth/accept.sol`
+##### `auth/reject.sol`
+
+#### `data`
+##### `data/balance_db.sol`
+##### `data/balance_db_test.sol`
+##### `data/approval_db.sol`
+##### `data/approval_db_test.sol`
+
+
+#### `util`
+##### `util/ephemeral.sol`
+##### `util/modifiers.sol`
+##### `util/true.sol`
+##### `util/false.sol`