Added memory command and engine prereqs

docs/zkEmailDocs/Installation/README.md

@@ -1,5 +1,10 @@
 ## **Installation**
 
+**Prerequisites:**
+
+- **Node.js**: Version 14.0.0 or higher.
+- **Yarn**: Latest version recommended.
+
 To get started with zk-email, install these three npm packages:
 ## **1.  @zk-email/helpers**
 This package provides utility functions for email verification and cryptographic operations.

docs/zkEmailDocs/Package Overviews/README.md

@@ -54,8 +54,6 @@ The `@zk-email/helpers` package provides a comprehensive suite of utility functi
     - `tryRevertARCChanges`: A flag indicating whether to attempt reverting changes made by email forwarders, defaulting to true.
   - **Returns:** A `Promise` resolving to a `DKIMVerificationResult` object, which includes details such as the public key, signature, message, body, and other relevant verification outcomes.
 
-
-
 ## zk-email/contracts
 
 The @zk-email/contracts package contains the main contract of the SDK, `DKIMRegistry.sol`. This Solidity contract serves as a registry for storing the hash of the DomainKeys Identified Mail (DKIM) public key for each domain.

docs/zkEmailDocs/UsageGuide/README.md

@@ -135,6 +135,12 @@ Firstly, you need to determine the constraint size of your circuit. You can do t
 ```bash
 snarkjs r1cs info myCircuit.r1cs
 ```
+### Memory Allocation for snarkjs
+To avoid out-of-memory errors in `snarkjs` for large circuits, increase Node.js memory with `node --max-old-space-size=<size>`, where `<size>` is in kilobytes.
+```
+node --max-old-space-size=614400 ./../node_modules/.bin/snarkjs
+```
+
 
 ### Powers of Tau
 After obtaining the constraint size, find the next highest power of 2 and replace the '12' in the following command with that number. This command initiates the Powers of tau ceremony.

package.json

@@ -8,5 +8,8 @@
     "packages/*",
     "scripts"
   ],
-  "packageManager": "[email protected]"
+  "packageManager": "[email protected]",
+  "engines": {
+    "node": ">=14.0.0"
+  }
 }