Implement session invites

functions/EstimationSessionInvite/README.md

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+# Estimation Session Invite Function
+
+This function allows other users to join an existing estimation session by providing it's Id.
+
+## Usage
+
+### GET /?action=get-info&estimationId=[session-id]
+
+- Gets session's information by id
+
+**Response**
+
+Sample `200` Response:
+
+```json
+{
+  "id": "session-id",
+  "name": "session name"
+}
+```
+
+### GET /?action=join&estimationId=[session-id]
+
+- Joins session by id
+
+**Response**
+
+Sample `200` Response:
+
+```json
+{
+  "message": "Estimation session joined"
+}
+```
+
+## Environment Variables
+
+- APPWRITE_DATABASE_ID - Database Id
+- APPWRITE_ESTIMATION_SESSION_COLLECTION_ID - Sessions collection Id