feat: add presentation

.drone.yml

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+---
+kind: pipeline
+type: exec
+name: Build and deploy
+
+steps:
+  - name: Build Presentation
+    commands:
+      - cd presentation
+      - marp presentation.md -o index.html
+      - cp * /home/andr3/services/notes/presentation
+
+trigger:
+  branch:
+    - main
+node:
+  lights: builder
+

presentation/presentation.md

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+---
+style: |
+  img[alt~="center"] {
+    display: block;
+    margin: 0 auto;
+  }
+
+  h3 {
+    font-size: 1.2em;
+    position: fixed;
+    top: 1em;
+    left: 50%;
+    transform: translateX(-50%);
+  }
+
+  h4 {
+    text-align: center;
+    font-size: 1.2em;
+    text-align: center;
+  }
+
+  img[alt~="top-m"] {
+    margin-top: 40px;
+  }
+
+---
+
+# A Paxos implementation
+
+Andre Henriques
+
+---
+
+# Basis of the implentation
+
+
+![Structure](./structure.png) ![Steps](./steps.png)
+
+---
+
+# Steps
+
+```elixir
+receive do
+  {:leader_elector, proc} -> ...
+  {:propose, inst, value, t, pid_to_inform} -> ...
+  {:prepare, proc, inst, ballot} -> ...
+  {:nack, inst, ballot} -> ...
+  {:prepared, inst, ballot, accepted_ballot, accepted_value} -> ...
+  {:accept, inst, ballot, value} -> ...
+  {:accepted, inst, ballot} -> ...
+  {:decide, inst, value} -> ...
+end
+```
+
+---
+
+### Step 1 - "Requirements"
+
+![50% center](./first-step.png)
+
+---
+
+### Step 2 - "Prepare"
+
+![w:600 center](./second-step.png)
+
+---
+
+### Step 3 - "Accept"
+
+![w:600 center](./third-step.png)
+
+--- 
+
+### Step 4 - "Leader Crash"
+
+![w:600 center](./fourth-step.png)
+
+---
+
+# Application
+
+---
+
+### Atomas
+
+![w:300 center top-m](./atomas.png)
+
+
+---
+
+## Safety
+ - If a game state exists, then it was created by a user
+ - The game state can not divert.
+
+## Liveness
+ - Eventually all users will have the same game state
+
+--- 
+
+#### Questions?