readme: initial version

Author: ligurio

README.md

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+### Seed corpus
+
+The repository contains seed corpus and dictionaries for Lua
+fuzzing tests.
+
+### Merge corpuses
+
+```sh
+build/tests/capi/luaL_loadbuffer_proto/luaL_loadbuffer_proto_test -set_cover_merge=1 CORPUS NEW_CORPUS
+build/tests/capi/luaL_loadbuffer_proto/luaL_loadbuffer_proto_test -merge=1 CORPUS NEW_CORPUS
+```
+
+### Maintenance
+
+To prevent repository bloat:
+
+```sh
+git rev-list --disk-usage --objects --all
+git reset --soft HEAD~2000 && git commit -m "Corpus squash"
+git prune --progress
+git gc
+```