add: separate treasury tests

frame/treasury/README.adoc

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+# Treasury Module
+
+The Treasury module provides a "pot" of funds that can be managed by stakeholders in the
+system and a structure for making spending proposals from this pot.
+
+- `treasury::Trait`
+- `Call`
+
+## Overview
+
+The Treasury Module itself provides the pot to store funds, and a means for stakeholders to
+propose, approve, and deny expenditures.  The chain will need to provide a method (e.g.
+inflation, fees) for collecting funds.
+
+By way of example, the Council could vote to fund the Treasury with a portion of the block
+reward and use the funds to pay developers.
+
+### Terminology
+
+- **Proposal:** A suggestion to allocate funds from the pot to a beneficiary.
+- **Beneficiary:** An account who will receive the funds from a proposal iff
+the proposal is approved.
+- **Deposit:** Funds that a proposer must lock when making a proposal. The
+deposit will be returned or slashed if the proposal is approved or rejected
+respectively.
+- **Pot:** Unspent funds accumulated by the treasury module.
+
+## Interface
+
+### Dispatchable Functions
+
+- `propose_spend` - Make a spending proposal and stake the required deposit.
+- `set_pot` - Set the spendable balance of funds.
+- `configure` - Configure the module's proposal requirements.
+- `reject_proposal` - Reject a proposal, slashing the deposit.
+- `approve_proposal` - Accept the proposal, returning the deposit.
+
+## GenesisConfig
+
+The Treasury module depends on the `GenesisConfig`.