docs: memory segment

docs/docs/memory.md

@@ -0,0 +1,29 @@
+---
+id: memory
+title: Memory
+sidebar_label: Memory
+---
+
+## Memory
+
+Display memory usage percentage.
+
+## Sample Configuration
+
+```json
+{
+  "type": "memory",
+  "style": "powerline",
+  "foreground": "#26C6DA",
+  "background": "#2f2f2f",
+  "properties": {
+    "precision": 1,
+    "prefix": " \uf85a ",
+    "postfix": "% "
+  }
+}
+```
+
+## Properties
+
+- precision: `int` - the number of decimal places to show - defaults to `0`