Add release docs

.env.template

@@ -0,0 +1,10 @@
+export JANKY_SHA1=`git rev-parse --short HEAD`
+export JANKY_BRANCH=stable
+export TRAVIS=1
+export ATOM_ACCESS_TOKEN=<TOKEN>
+export XCODE_KEYCHAIN=osx-build.keychain
+export XCODE_KEYCHAIN_PASSWORD=<PASSWORD>
+export KEY_PASSWORD=<PASSWORD>
+export BUILD_ATOM_RELEASES_S3_BUCKET=particle-dev-releases
+export BUILD_ATOM_RELEASES_S3_KEY=<PASSWORD>
+export BUILD_ATOM_RELEASES_S3_SECRET=<PASSWORD>

.gitignore

@@ -1,4 +1,5 @@
 .DS_Store
 npm-debug.log
 node_modules
-dist/
+dist/
+.env

RELEASE.md

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+`particle-dev-app` releases are linked with [Atom releases](https://github.com/atom/atom/releases) meaning we only release versions matching exactly version of Atom which is used. As Atom's releases are more frequent, during each `particle-dev-app` release we try to update Atom to latest stable version.
+
+# Steps
+
+0. Create `.env` file based on [`.env.template`](.env.template)
+1. Update Atom version/abi in [`.atomrc`](.atomrc)
+2. Update [`particle-dev`](https://github.com/spark/particle-dev/releases) package in [`.atomrc`](.atomrc)
+3. Update packages in [`inject-packages` step](build/tasks/inject-packages.coffee)
+4. Run `script/build`