Merge pull request #3494 from AnotherButler/patch-10

Delete ignoring_files_from_build.md

docs/ignoring_files_from_build.md

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-# Ignoring files from mbed build
-
-The `.mbedignore` file allows you to ignore files and directories from being processed by `mbed build` command.
-
-## Usage
-You can place the `.mbedignore` file in any directory where `mbed build` command is going to search for source files.
-
-The most convenient place is the root directory of the library or application. However, this is not a requirement.
-
-Avoid defining rules that would cross the library boundaries as those would lead to side effects or build problems that are hard to find.
-
-## Syntax
-
-Each line in the `.mbedignore` file is a file pattern used for matching files. Each matched file or directory is ignored from build.
-
-The following wildcards are accepted:
-
-|Pattern | Meaning|
-|--------|--------|
-| `*` | Matches everything. |
-| `?` | Matches any single character. |
-| `[seq]` | Matches any character in seq. |
-| `[!seq]` | Matches any character not in seq. |
-
-File is parsed with Python's [fnmatch](https://docs.python.org/2/library/fnmatch.html) functionality so the syntax follows basic shell patterns with the following exceptions:
-
-1. Each line is internally prefixed with the path of the `.mbedignore` file.
-2. Line cannot start with `.` or `/` (because of rule 1)
-
-Globbing functionality is not used, so you cannot recursively match specific file pattern. You need to define rule per directory in that case.
-
-Relative paths can be used, so you can match files deeper in the build tree. However, avoid crossing library boundaries.
-
-### Example
-A file located in `source/obsolete/.mbedignore` with following content:
-
-```
-*.c
-*.h
-second_level/*.c
-```
-
-After applying the rule 1, actual patterns used internally for matching the source files are:
-
-```
-source/obsolete/*.c
-source/obsolete/*.h
-source/obsolete/second_level/*.c
-```