👌 Various improvements

- Properly draw the menu bar icon
  (now with extra documentation)
- Resolve Paths via FileManager.default
- Updated DEV readme
- Add PHP Elephant icon (TBD)

DEVELOPER.md

@@ -0,0 +1,46 @@
+# DEVELOPER README
+
+## 🔧 Build instructions
+
+<img src="./docs/build.png" width="404px" alt="build button in Xcode"/>
+
+If you'd like to build PHP Monitor yourself, you need:
+
+* Xcode (usually the latest version)
+* The contents of this repository
+
+Once you have downloaded this repository, open `PHP Monitor.xcodeproj`, and you should be able to immediately build the app for your system by pressing Cmd-R. This will create a debug build. (If Xcode complains about code signing, you can turn it off.)
+
+If you'd like to create a production build, choose "Any Mac" as the target and select Product > Archive.
+
+## 🐛 Symbolication of crashes
+
+If you have an archived build of the app and exported the DSYM, it is possible to symbolicate .ips crash logs.
+
+For example, given the following crash (from an .ips file):
+
+```
+Thread 2 Crashed::  Dispatch queue: com.apple.root.user-initiated-qos
+0   libswiftDispatch.dylib        	    0x7ff82aa3ab8c static OS_dispatch_source.makeProcessSource(identifier:eventMask:queue:) + 28
+1   PHP Monitor                   	       0x1096907d8 0x10965e000 + 206808
+                                                |            |
+                                             address      load address
+2   PHP Monitor                   	       0x1096903ac 0x10965e000 + 205740
+3   PHP Monitor                   	       0x10968f88b 0x10965e000 + 202891
+```
+
+You must use the correct order for the the address and load address in the command below:
+
+```
+$ atos -arch x86_64 -o '/path/to/PHP Monitor.app.dSYM/Contents/Resources/DWARF/PHP Monitor' -l 0x10965e000 0x1096907d8
+             |                                           |                                       |              |
+             architecture                                path to DSYM                         load address    address
+```
+
+This will return the relevant information, for example:
+
+```
+FSWatcher.startMonitoring(_:behaviour:) (in PHP Monitor) (PhpConfigWatcher.swift:95)
+```
+
+For more information, see [Apple's documentation](https://developer.apple.com/documentation/xcode/adding-identifiable-symbol-names-to-a-crash-report).