add docs for negotiation example

integrations/agent-negotiation/README.md

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+# Agent based Negotiation
+
+This example is two locally running agents Alice and Bob.
+
+Periodically, Alice will start a negotiation with Bob. Bob will respond with a counter offer. This will continue until a deal is reached or the negotiation times out.
+
+This serves as an simple example of how to use the `Agent` class to create a simple negotiation.
+
+## Running the agents
+
+Install dependencies
+
+```bash
+poetry install
+```
+
+Enter the poetry shell
+
+```bash
+poetry shell
+```
+
+Start the agents
+
+```bash
+python3 main.py
+```