[FL-2059] Storage fixes for handling empty files (#1563)

* storage: fixed handling of zero-length files
* docs: added ReadMe.md for vscode workspace
* rpc: storage: improved empty file & error handling in write handler
* docs: markdown fix
* docs: typo fixes

Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

.vscode/ReadMe.md

@@ -0,0 +1,17 @@
+# Visual Studio Code workspace for Flipper Zero
+
+## Setup
+
+ * To start developing with VSCode, run `./fbt vscode_dist` in project root. _That should only be done once_
+ * After that, open firmware folder in VSCode: "File" > "Open folder"
+
+ For more details on fbt, see [fbt docs](../documentation/fbt.md).
+
+
+## Workflow
+
+Commands for building firmware are invoked through Build menu: Ctrl+Shift+B.
+
+To attach a debugging session, first build and flash firmware, then choose your debug probe in Debug menu (Ctrl+Shift+D).
+
+Note that you have to detach debugging session before rebuilding and re-flashing firmware.