Added the poll for fip-0014

Author: jennijuju

polls/FIP-0014: Allow All V1 Proof Sectors' Lifetime To Be Maxiumn 540 Days in Epoch.md

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+**Background**
+This poll is to gather the community's sentiment on [FIP-0014](https://github.com/filecoin-project/FIPs/blob/master/FIPS/fip-0014.md). Discussions about this FIP can be carried out in the original [FIP issue #56](https://github.com/filecoin-project/FIPs/issues/56).
+
+**Proposal**
+Allow all V1 proof sectors to be extended up to a maximum of 540 days in epoch as sectors' lifetime.
+
+**Impact**
+Please see this report(TODO: add link) from [BlockScience](https://github.com/BlockScience) to understand the impact of the V1 setocr expiration wave on Filecoin Cryptoecon metric.
+
+> Note: Core implementers will take the poll result, discuss it in a core dev meeting and makes final decision on whether the FIP should be accepted in the network or not.
+
+---
+Options:
+- **< Approve >**: < I approve FIP-0014 >
+- **< Reject >**: < I reject FIP-0014 >
+
+---
+start: 2021-03-23 16:00
+end: 2021-03-27 16:00
+constituents: [ storageminers ]
+author: [@deltazxm](https://github.com/deltazxm), [@neogeweb3](https://github.com/neogeweb3), [@Fatman13](https://github.com/Fatman13) 
+discussion: https://github.com/filecoin-project/FIPs/issues/56
+