Short intro doc to AA and WaaS with Particle Network (#219)

docs/developers/omnichain/tutorials/particle.md

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+# Account Abstraction: Particle Network
+
+Particle Network offers a comprehensive set of tools and services designed to
+enhance the user experience of decentralized applications (dApps) on ZetaChain.
+
+Particle Network's stack natively supports
+[ERC-4337 Account Abstraction](https://eips.ethereum.org/EIPS/eip-4337),
+empowering developers to implement smart accounts from the initial user
+onboarding to the final construction and sponsorship of user operations.
+
+Particle Network offers Wallet as a Service (WaaS), an alternative to
+extension-based wallets, allowing users to create non-custodial accounts using
+mechanisms similar to those of traditional web apps, for example, social login
+and email/password. WaaS are embedded into web apps, so users can interact with
+dApps without having to install any additional software.
+
+Main components of the Particle Network stack:
+
+- [Wallet as a Service](https://particlenetwork.readme.io/docs/understanding-wallet-as-a-service)
+  (WaaS). WaaS allows a user to sign in to a dApp using social login or
+  email/password. Within "classic" Wallet-as-a-Service, an
+  Externally-Owned-Account (EOA) is the ending point after login. Alternatively,
+  using account abstraction this EOA is used as an intermediary and instead the
+  user is assigned a smart account to use for interaction.
+- Account abstraction (AA)
+  - [Bundler](https://particlenetwork.readme.io/docs/bundler). As apart of the
+    AA stack Particle Network offers an open-source Bundler in which all
+    "useroOperations" are constructed and sent.
+  - [Paymaster](https://particlenetwork.readme.io/docs/paymaster). Alongside the
+    Bundler, Particle Network also offers a paymaster for multi-chain gas
+    sponsorship.
+
+Particle Network's stack is modular, so developers can choose to use only the
+components they need.
+
+## Next Steps
+
+To learn more about how Particle Network WaaS can be used to build dApps on
+ZetaChain, check out the comprehensive tutorial on integrating a wallet into a
+React-based web app:
+
+https://particlenetwork.readme.io/docs/leveraging-particle-network-on-zetachain