Added README.md

README.md

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+# Breakups
+
+Creating a payment chain for bill splitting needs
+
+api domain: `https:\\breakups.herokuapp.com\`
+
+## API Call Documentations
+
+| Type | Call | Request | Response |
+|:-----|:-----|:--------|:---------|
+| `GET` | `help` | - | URL to github repository |
+| `POST` | `total` | [standard format](#standard-format) | `{ "total": 200 }` |
+| `POST` | `perPerson` | [standard format](#standard-format) | `{ "perPerson": 30 }` |
+| `POST` | `oweChart` | [standard format](#standard-format) | [standard format](#standard-format) |
+| `POST` | `sortedOweChart` | [standard format](#standard-format) | [standard format](#standard-format) |
+| `POST` | `paymentChain` | [standard format](#standard-format) | [chain format](#chain-format) |
+
+## Expected Request / Response
+
+### standard format
+
+```JSON
+{
+  "users": [
+    {
+      "name": "Person1",
+      "amount": 100
+    },
+    {
+      "name": "Person2",
+      "amount": 50
+    },
+    {
+      "name": "Person3",
+      "amount": 30
+    }
+  ]
+}
+```
+
+### chain format
+
+```JSON
+[
+  {
+    "from": "Person2",
+    "to": "Person3",
+    "amount": 10
+  },
+  {
+    "from": "Person3",
+    "to": "Person1",
+    "amount": 40
+  }
+]
+```