add obs rtirl stuff

obs/README.md

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+# OBS Configuration
+
+Notes about how I configure my OBS for live streaming mostly to Twitch.

obs/rtirl.md

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+# RTIRL overlays
+
+## Common custom CSS
+
+```css
+@import url('https://fonts.googleapis.com/css2?family=Bangers&display=swap');
+  body {
+color: rgba(255, 255, 255, 1);
+font-size: 30px;
+font-family: Bangers;
+font-weight: normal;
+font-style: normal;
+transform: rotate(0deg);
+background-color: rgba(255, 255, 255, 0);
+border-color: rgba(255, 255, 255, 1);
+border-width: 0px;
+border-style: solid;
+text-align: right;
+border-radius: 0% 0% 0% 0%;
+padding: 0px;
+-webkit-text-stroke-width: 0px;
+-webkit-text-stroke-color: rgba(255, 255, 255, 1);
+text-shadow: 2px 2px 0px rgba(0, 0, 0, 1)
+}
+```
+
+## Time
+
+https://overlays.rtirl.com/datetime/luxon.html?key=PUSHKEY&lang=en&format=fff
+