improve readme

spikes/leak/readme.md

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+# leak
+
+ - 1. Spawn a bunch of servers:
+    - another-fast: a node with a linear memory leak
+    - fast: a node with a linear memory leak
+    - slow: a node with a memory leak that grows very slowly
+    - plain: a node with no memory leak 
+ - 2. Spawn an [artillery](https://artillery.io) for each node that loads it with a small but constant stream of requests
+ - 3. Spawn Prometheus that watches the cpu/memory of each node
+
+Then, locally we start the same server and we can see the different instances and an aggregate of the metrics for each job.
+
+## usage
+
+```
+λ docker-compose up
+λ node .
+```
+
+Go to http://127.0.0.1:8000/ and see the result.
+The [Prometheus](https://prometheus.io) is also listening at http://127.0.0.1:9090/
+
+## example
+
+![](https://cldup.com/yxS380e1HN.png)