[draft] draft for use-plugin use-session-key

docs/use-wallets/zerodev-plugins/build-your-own-plugin.md

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 # Build your own plugin

docs/use-wallets/zerodev-plugins/use-plugin.md

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+sidebar_position: 1
+---
+
+# Use Plugin
+
+Using plugin will require user to have a `EIP4337PluginFallbck` as fallback module. This module can handle classic EIP4337's validateUserOp, and plugin based validateUserOp.
+
+If plugin fallback is set, userOp with signature longer than 97 will automatically considered as plugin based userOp.
+
+Signature of userOp is constructed as following
+
+```
+signature[0:20] = pluginAddress
+signature[20:26] = validUntil
+signature[26:32] = validAfter
+signature[32:97] = user signed signature
+signature[97:] = abi.encode(bytes pluginData, bytes pluginProof)
+```
+
+user will be required to sign the data using EIP712 with struct [`ValidateUserOpPlugin`](#ValidateUserOpPlugin)
+
+By signing the signature, user should be noticed that they are delegating validation process to plugin, thus plugin can do anything with their wallet.
+
+Also, it should be aware that `validUntil`, `validAfter` value should be tight enough to make user feel safe.
+
+# Reference
+
+## ValidateUserOpPlugin
+
+```solidity
+struct ValidateUserOpPlugin {
+    address sender;
+    uint48 validUntil;
+    uint48 validAfter;
+    address plugin;
+    bytes data;
+}
+```

docs/use-wallets/zerodev-plugins/use-session-keys.md

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 # Use session keys
 
-UPCOMING
+If user approved a session key plugin, user will be allowing the "sessionKey" to sign userOp on their behalf.
+
+userOp's signature will have `pluginData` and `pluginProof` appended to it.
+
+`pluginData` will represent sessionKey that is used to sign the userOp.
+
+`pluginProof` will represent the signature of the userOp signed by sessionKey.
+
+sessionKey is required to sign the userOpHash and sessionNonce using EIP712 with struct [`Session`](#Session)
+
+# Reference
+
+## Session
+
+```solidity
+struct Session {
+    bytes32 userOpHash;
+    uint256 nonce;
+}
+```