docs: Add info about ZyFi (#357)

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# Description

<!-- Please describe what are the changes and what they are solving for
in this PR. -->

- Created new page about Paymasters in Ecosystem page
- Added info about ZyFi in paymasters page

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## Additional context

---------

Co-authored-by: Antonio <[email protected]>

Author: 0xSulpiride

content/00.zksync-era/60.ecosystem/00.index.md

@@ -72,4 +72,12 @@ To see a wider list of the ecosystem, check out [ZKsync Era on DappRadar](https:
   ---
   Keep track of network operations with our comprehensive monitoring tools.
   ::
+  ::card
+  ---
+  title: Paymaster Service
+  icon: i-heroicons-banknotes-16-solid
+  to: /zksync-era/ecosystem/paymasters
+  ---
+  Discover the paymasters solutions available on ZKsync.
+  ::
 ::

content/00.zksync-era/60.ecosystem/120.paymasters.md

@@ -0,0 +1,11 @@
+# Paymasters
+
+Paymasters are specialized accounts designed to subsidize transaction fees for users, enhancing usability and flexibility within protocols.\
+They also facilitate the payment of fees using ERC20 tokens, instead of the default ETH.
+
+### ZyFi
+
+[ZyFi](https://www.zyfi.org/) is a seamless gas abstraction solution powering over 3M sponsored transactions across 30+ DApps.\
+It enables users to pay with 80+ ERC-20 tokens while offering robust sponsorship logic, Sybil prevention, and analytics.\
+With an API that's extremely easy to integrate, ZyFi removes complexity so protocols can focus on building products people love\
+ZyFi is already trusted by industry leaders like PancakeSwap, ZeroLend, SyncSwap, and many others.

cspell-config/cspell-misc.txt

@@ -36,3 +36,5 @@ undol
 trustlessly
 permissionlessly
 Zoltu
+Zyfi
+Gravita