Add instructions for data capture

CapturingPerfData.md

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+#### How To Collect a Gpuvis Capture:
+1. Open SteamVR Settings
+2. Click 'Developer'
+3. Ensure the 'Enable GPU profiling' checkbox is checked
+4. Restart SteamVR
+5. Follow the xterm prompt to complete the gpu profiler setup
+6. Open the following URL while SteamVR is running:
+  * http://localhost:8998/dashboard/debugcommands.html
+7. Click on the 'gpu\_profiler\_capture' button
+  * Note: Try to activate the capture process while the issue is happening.
+  * The gpuvis profiler only keeps a few seconds of buffered data in memory.
+7. In gpuvis, click 'File'->'Save as'
+8. Save the file to a location you can access
+9. Upload the file to Google Drive, Dropbox or your preferred file sharing site.
+10. Copy URL and paste it in the issue template
+
+#### How To Collect a Perf Top Snapshot:
+1. Run 'sudo perf top' from the commandline
+2. Copy the output to the clipboard when the issue occurs
+4. Browse to https://gist.github.com/
+5. Click in the text entry box (by the 1)
+6. Paste clipboard contents
+7. Click 'Create Public Gist'
+8. Copy URL and paste it in the issue template

CapturingSystemReport.md

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+#### How To Collect SteamVR System Information:
+1. Click the 'SteamVR beta' menu in the upper left of the SteamVR Status window
+2. Click 'Create System Report'
+3. Click 'Copy to Clipboard'
+4. Browse to https://gist.github.com/
+5. Click in the text entry box (by the 1)
+6. Paste clipboard contents
+7. Click 'Create Public Gist'
+8. Copy URL and paste it in the issue template