v1.0.0 for LittleFS and FATFS

### Initial Releases v1.0.0

1. Initial coding to support MBED nRF52840-based boards such as **Nano_33_BLE, Nano_33_BLE_Sense**, etc. using [**Arduino-mbed mbed_nano** core](https://github.com/arduino/ArduinoCore-mbed)

Author: khoih-prog

.gitignore

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+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app

CONTRIBUTING.md

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+## Contributing to FS_Nano33BLE
+
+### Reporting Bugs
+
+Please report bugs in [FS_Nano33BLE Issues](https://github.com/khoih-prog/FS_Nano33BLE/issues) if you find them.
+
+However, before reporting a bug please check through the following:
+
+* [Existing Open Issues](https://github.com/khoih-prog/FS_Nano33BLE/issues) - someone might have already encountered this.
+
+If you don't find anything, please [open a new issue](https://github.com/khoih-prog/FS_Nano33BLE/issues/new).
+
+### How to submit a bug report
+
+Please ensure to specify the following:
+
+* Arduino IDE version (e.g. 1.8.15) or Platform.io version
+* `Arduino mbed_nano` Core Version (e.g. Arduino mbed_nano core v2.4.1)
+* `nRF52840-based Nano_33_BLE` Board type (e.g. Nano_33_BLE, Nano_33_BLE_Sense, etc.)
+* Contextual information (e.g. what you were trying to achieve)
+* Simplest possible steps to reproduce
+* Anything that might be relevant in your opinion, such as:
+  * Operating system (Windows, Ubuntu, etc.) and the output of `uname -a`
+  * Network configuration
+
+
+### Example
+
+```
+Arduino IDE version: 1.8.15
+Arduino mbed_nano core v2.4.1
+Nano_33_BLE board
+OS: Ubuntu 20.04 LTS
+Linux xy-Inspiron-3593 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:09:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
+
+Context:
+I encountered a crash while using TimerInterrupt.
+
+Steps to reproduce:
+1. ...
+2. ...
+3. ...
+4. ...
+```
+
+### Sending Feature Requests
+
+Feel free to post feature requests. It's helpful if you can explain exactly why the feature would be useful.
+
+There are usually some outstanding feature requests in the [existing issues list](https://github.com/khoih-prog/FS_Nano33BLE/issues?q=is%3Aopen+is%3Aissue+label%3Aenhancement), feel free to add comments to them.
+
+### Sending Pull Requests
+
+Pull Requests with changes and fixes are also welcome!