Create readme.md

Add description of the aspace_svn process

docs/aspace_svn/readme.md

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+This process sends ArchivesSpace records, serialized as EAD, to SVN once a month.
+
+### Summary
+The [get_eads](https://github.com/pulibrary/lib_jobs/blob/main/lib/tasks/lib_jobs.rake) task runs the [get_eads_job](https://github.com/pulibrary/lib_jobs/blob/main/app/models/aspace_svn/get_eads_job.rb
+). It is [scheduled](https://github.com/pulibrary/lib_jobs/blob/main/config/schedule.rb) to run on the first Saturday of the month.
+
+### Steps
+1. authenticate to SVN and ASpace
+2. create directory structure if it doesn't already exist
+3. download EADs for all repos
+4. update SVN
+5. add and commit to SVN
+