safe price v2 README documentation

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Contract comparison - from d49b05d to 8a679a5

Path	size	has-allocator	has-format
mx-exchange-sc
- pause-all/pause-all.wasm	5681	No	No
mx-exchange-sc/dex
- farm/farm.wasm	38135	No	No
- farm-with-locked-rewards/farm-with-locked-rewards.wasm	37818	No	No
- governance/governance.wasm	17796	No	No
- pair
- - pair.wasm	31040	No	No
- - pair-full.wasm	32767	No	No
- - safe-price-view.wasm	8201	No	No
- pair-mock/pair-mock.wasm	5641	No	No
- price-discovery/price-discovery.wasm	16324	No	No
- proxy-deployer/proxy-deployer.wasm	4660	No	No
- router/router.wasm	25691	No	No
mx-exchange-sc/energy-integration
- energy-factory-mock/energy-factory-mock.wasm	4365	No	No
- energy-update/energy-update.wasm	1567	No	No
- fees-collector/fees-collector.wasm	18788	No	No
- governance-v2/governance-v2.wasm	17246	No	No
mx-exchange-sc/farm-staking
- farm-staking/farm-staking.wasm	41675	No	No
- farm-staking-proxy/farm-staking-proxy.wasm	23090	No	No
- metabonding-staking/metabonding-staking.wasm	9707	No	No
mx-exchange-sc/locked-asset
- distribution/distribution.wasm	14776	No	No
- energy-factory/energy-factory.wasm	34491	No	No
- factory/factory.wasm	30573	No	No
- lkmex-transfer/lkmex-transfer.wasm	11429	No	No
- locked-token-wrapper/locked-token-wrapper.wasm	14209	No	No
- proxy_dex/proxy_dex.wasm	35355	No	No
- simple-lock/simple-lock.wasm	24662	No	No
- simple-lock-whitelist/simple-lock-whitelist.wasm	26318	No	No
- token-unstake/token-unstake.wasm	14082	No	No