doc: Move out docs from main README

docs/ignoring-files.md

@@ -0,0 +1,29 @@
+# Ignoring Files
+
+QodeAssist supports the ability to ignore files in context using a `.qodeassistignore` file. This allows you to exclude specific files from the context during code completion and in the chat assistant, which is especially useful for large projects.
+
+## How to Use .qodeassistignore
+
+- Create a `.qodeassistignore` file in the root directory of your project near CMakeLists.txt or pro.
+- Add patterns for files and directories that should be excluded from the context.
+- QodeAssist will automatically detect this file and apply the exclusion rules.
+
+## .qodeassistignore File Format
+
+The file format is similar to `.gitignore`:
+- Each pattern is written on a separate line
+- Empty lines are ignored
+- Lines starting with `#` are considered comments
+- Standard wildcards work the same as in .gitignore
+- To negate a pattern, use `!` at the beginning of the line
+
+## Example
+
+```
+# Ignore all files in the build directory
+/build
+*.tmp
+# Ignore a specific file
+src/generated/autogen.cpp
+```
+