add rough draft of node, crashpad update notes

docs/development/upgrading-crashpad.md

@@ -0,0 +1,36 @@
+- Get the version of crashpad that we're going to use.
+  - `libcc/src/third_party/crashpad/README.chromium` will have a line `Revision:` with a checksum.
+  - clone [Electron's Crashpad fork](https://github.com/electron/crashpad) and create a new branch
+  - `git clone https://chromium.googlesource.com/crashpad/crashpad`
+  - `git checkout 01110c0a3b`
+  - `git remote add electron https://github.com/electron/crashpad`
+  - `git checkout -b electron-crashpad-vA.B.C.D`
+     - `A.B.C.D` is the Chromium version found in `libcc/VERSION`
+       and will be something like `62.0.3202.94`
+
+- Make a checklist of the Electron patches we need to apply
+  e.g. `git log --oneline`
+  or view http://github.com/electron/crashpad/commits/previous-branch-name
+- Foreach patch:
+  - (in new branch) `git cherry-pick checksum`
+  - resolve any conflicts
+  - make sure it builds
+  - add && commit
+- Push your work:
+  `git push electron electorn-crashpad-v62.0.3202.94`
+
+- Update Electron to build the new crashpad:
+  - `cd vendor/crashpad`
+  - `git fetch`
+  - `git checkout electron-crashpad-v62.0.3202.94`
+- Regenerate Ninja files
+  - from Electron root's root, run `script/update.py`
+  - `script/build.py -c D --target=crashpad_client`
+  - `script/build.py -c D --target=crashpad_handler`
+  - If both of these work, it's probably good.
+- Push changes to submodule reference
+  - (from electron root) `git add vendor/crashpad`
+  - `git push origin upgrade-to-chromium-62`
+  
+
+