Add some initial instructions for adb logcat.

How-to-get-an-adb-logcat-from-a-PC.md

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+First get the adb tool from here:
+https://developer.android.com/studio/releases/platform-tools
+
+Then enable developer mode per this page (build 7 times):
+https://developer.android.com/studio/command-line/adb
+
+To use `adb logcat`:
+
+1. Extract the platform-tools zip somewhere.
+2. Plug your phone into your PC via USB.
+3. Open a command prompt (Start -> command prompt.)
+4. Drag the "adb" program from the extracted zip into the command prompt.  You'll see something like:
+
+   ```
+   C:\Users\Me>"C:\Users\Me\Downloads\platform-tools_r28.0.1-windows\platform-tools\adb.exe"
+   ```
+
+5. Keep typing after that, starting with a space (you can copy and paste this, just make sure there's a space before the 'logcat' part, or just press space before pasting it... too many spaces is okay):
+
+   ```
+    logcat > "%USERPROFILE%\Desktop\ppsspp.log"
+   ```
+
+6. Now press enter.  Your device might show a message asking you to confirm debugging.  Go ahead and allow.
+7. Now just reproduce the problem on your device.  Make sure not to unplug the USB cord.
+8. Once you're done, go back to that command prompt window and press Ctrl-C.  It should go back to a new line like `C:\Users\Me>`.
+9. There should be a file named "ppsspp.log" on your desktop.  Zip it up, and attach it here.