(#340) Add Contributing Rules

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+# Issues
+
+- Feel free to submit an issues in case of
+  - bug
+  - suggestion
+  - feature request
+  - question regarding the project
+  - unclear documentation
+  - unreadable or straight up bad code
+  - any problem that you ran into while setting up the project on your side
+- Do not submit **Tasks**. Submit **Problems**.
+  - Bad issue: "Rewrite everything in Rust"
+  - Good issue: "Using C makes the development difficult"
+  - We are engineers. We don't follow anybody's direction. We solve problems. Please submit problems.
+
+# Pull Requests
+
+- Keep your PRs nice and small around 300 changes. PRs that are way over that threshold won't be merged.
+  - If 300 changes is not enough,
+    - make as many changes as you can according to the PR size limitation,
+    - make sure that the code is compilable and the application is usable,
+    - create TODOs right in the code for the unfinished work,
+    - submit PR with the unfinished work and TODOs,
+    - TODOs will be converted to separate issues