chore: escrow template and mappings example

Author: jaybuidl

kleros-sdk/config/v2-disputetemplate/reality/example4/DisputeMappings.json.mustache

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+[
+    {
+        "type": "graphql",
+        "endpoint": "https://api.thegraph.com/subgraphs/name/kemuru/escrow-v2-devnet",
+        "query": "query GetTransaction($transactionId: ID!) { escrow(id: $transactionId) { transactionUri buyer seller amount asset deadline } }",
+        "variables": {
+            "transactionId": "{{externalDisputeID}}"
+        },
+        "seek": [
+            "escrow.transactionUri",
+            "escrow.buyer",
+            "escrow.seller",
+            "escrow.amount",
+            "escrow.asset",
+            "escrow.deadline"
+        ],
+        "populate": [
+            "transactionUri",
+            "address",
+            "sendingRecipientAddress",
+            "amount",
+            "asset",
+            "deadline"
+        ]
+    },
+    {
+        "type": "fetch/ipfs/json",
+        "ipfsUri": "{{transactionUri}}",
+        "seek": [
+            "title",
+            "description",
+            "extraDescriptionUri"
+        ],
+        "populate": [
+            "escrowTitle",
+            "deliverableText",
+            "extraDescriptionUri"
+        ]
+    }
+]

kleros-sdk/config/v2-disputetemplate/reality/example4/DisputeTemplate.json.mustache

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+{
+    "title": "{{escrowTitle}}",
+    "description": "{{deliverableText}}",
+    "question": "Which party abided by the terms of the contract?",
+    "answers": [
+        {
+            "title": "Refund the Buyer",
+            "description": "Select this to return the funds to the Buyer."
+        },
+        {
+            "title": "Pay the Seller",
+            "description": "Select this to release the funds to the Seller."
+        }
+    ],
+    "policyURI": "ipfs://TODO",
+    "attachment": {
+        "label": "Transaction Terms",
+        "uri": "{{extraDescriptionUri}}"
+    },
+    "frontendUrl": "https://escrow-v2.kleros.builders/#/myTransactions/{{externalDisputeID}}",
+    "arbitrableChainID": "421614",
+    "arbitrableAddress": "{{arbitrator}}",
+    "arbitratorChainID": "421614",
+    "arbitratorAddress": "{{arbitrable}}",
+    "metadata": {
+        "buyer": "{{address}}",
+        "seller": "{{sendingRecipientAddress}}",
+        "amount": "{{sendingQuantity}}",
+        "asset": "{{asset}}",
+        "deadline": "{{deadline}}",
+        "transactionUri": "{{transactionUri}}"
+    },
+    "category": "Escrow",
+    "specification": "KIPXXX",
+    "aliases": {
+        "Buyer": "{{address}}",
+        "Seller": "{{sendingRecipientAddress}}"
+    },
+    "version": "1.0"
+}