Added package build and develop instructions.

BUILD.md

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+# Build Instructions
+
+Run the following command to build the project:
+
+```shell
+python -m build
+```
+
+This will create distribution files in the `dist/` directory.
+
+Install the built package using pip:
+
+```shell
+pip install --no-index dist/docs_harvester-0.1.0-py3-none-any.whl
+```
+
+Install in editable mode for development:
+
+```shell
+pip install -e .
+```