Add 'Roadmap'

Roadmap.md

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+# Unsettled Roadmap
+
+This is only a rough draft used to classify the tasks and make workload sharing easier.
+
+
+## Task classification
+
+Can be implemented in parallel:
+- repo health: 
+  - check repo size 
+  - ensure checksum of basic files in unchanged (eg. `.drone.yml, .gitattributes, .gitignore`)
+  - ensure no forbidden files was pushed
+  - ensure existence of "must have files" (eg. changelog, readme)
+  - ensure ascii files only have been pushed
+  - ensure commit messages don't use non-ascii characters
+  - fail on any issue and return an error (with hints to fix the problem)
+- OJ module:
+  - library/package/(binary?) doing **only** the judging part 
+  - run a binary with cpu-time and memory constrains 
+  - return a "score"
+- config:
+  - define a "healthy" config file schema (using toml)
+  - read/parse config file
+- write a framework allowing to run commands and combine all tasks together
+- gitea interface:
+  - handle issues (open, post comments, set tags, milestone, etc.)
+  - push files to a repo