adds docs from avaliability tests to the repo

docs/AVALIABILITY_TEST.md

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+# UniBasement-Avaliability-Tests
+Seperate Repo to keep my pi nice and smol :)
+
+## Overview
+A cron job was setup on a raspberry pi to run `script/script.sh` every 5 minutes.   
+
+The k6 test:
+* sends a `GET` request to the UniBasement frontend homepage to verify the user facing site is accessible
+* sends a `GET` request to the UniBasement backend courses route and checks the response body to verify the backend and database are both running
+
+
+## Results
+The test was running for 2 days, with only a 15 minute downtime at midnight on the 28th May. This means the uptime was 99.5%, which exceeds the required 99% uptime in the proposal.

tests/avaliability_tests/script.sh

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+#!/bin/bash
+
+k6 run ./test.js | grep -Poz '(?s)(?<=---).*?(?=---)' >> log.txt

tests/avaliability_tests/test.js

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+import { check, sleep } from "k6";
+import http from "k6/http";
+
+export const options = {
+    duration: '10s'
+};
+
+const frontendUrl = 'http://unibasement.g6.csse6400.xyz/'
+const backendUrl = 'http://unibasementBackend-2061383905.us-east-1.elb.amazonaws.com:8080/api/'
+
+export default function () {
+    let res = http.get(frontendUrl);
+    check(res, {
+        "frontend status was 200": (r) => r.status === 200,
+    });
+
+    res = http.get(backendUrl + 'courses');
+    check(res, {
+        "backend status was 200": (r) => r.status === 200,
+        "backend body contains list of courses": (r) => r.json().length > 0 && !!r.json()[0].courseCode,
+    });
+
+    sleep(0.1);
+}
+
+export function handleSummary(output) {
+    const formatted = output.root_group.checks.map((c) => `'${c.name}': ${c.passes}/${c.passes + c.fails}`)
+    return { stdout: `---\n[${new Date()}]\n` + formatted.join('\n') + '\n---\n' }
+}