Added precommit, adjusted README

.pre-commit-config.yaml

+default_stages: [commit, push]
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v2.1.0
+  hooks:
+  - id: check-added-large-files
+    args: [--maxkb=10000]
+
+  - id: check-json
+
+  - id: check-merge-conflict
+
+  - id: check-yaml
+
+  - id: end-of-file-fixer
+    types: [python]
+
+  - id: fix-encoding-pragma
+    args: [--remove]
+
+  - id: flake8
+    args: [--ignore=E501]
+
+  - id: forbid-new-submodules
+
+  - id: no-commit-to-branch
+
+  - id: pretty-format-json
+    args: [--autofix]
+
+  - id: trailing-whitespace
+    types: [python]
+
+-   repo: https://github.com/pryorda/dockerfilelint-precommit-hooks
+    rev: v0.1.0
+    hooks:
+      - id: dockerfilelint

README.md

@@ -61,6 +61,8 @@ bap PATH_TO_BINARY --recipe=recipes/RECIPE_FOLDER_NAME
 *cwe_checker* outputs to stdout. This output is parsable (sexep). There is a script `cwe_checker_to_ida` to visualize the results in IDA Pro.
 ## How to extend cwe_checker? ##
 New plugins should be added to src/checkers. Implement a .ml and .mli file. See the existing modules for an interface description. If necessary add a section to `config.json` to allow users to configure your plugin. Finally, add your plugin to `cwe_checker.ml`.
+
+If you plan to open a PR, please utilize [precommit](https://pre-commit.com) in your development environment to catch many issues before the code review.
 ### Contribute ###
 Contributions are always welcomed. Just fork it and open a pull request!
 ## Acknowledgements ##