Add release notes for 2021.01

Signed-off-by: David Abdurachmanov <[email protected]>

ReleaseNotes/2021.01.md

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+# Release Notes for 2020.12
+
+This release includes major changes compared previous Freedom Unleashed SDK and thus is **experimental** at this stage. Main changes include:
+
+- All layers (openembedded-core, meta-openemedded, meta-riscv, meta-clang) updated to their latest revisions.
+
+- stress-ng updated to 0.12.01.
+
+- Mesa updated to 20.3.1.
+
+- QEMU updated to 5.2.0.
+
+- Xfce updated to 4.16.0.
+
+## Known Issues
+
+1. Avoid overclocking SoC using CPUFreq if you are using HiFive Unleashed Expansion Board from Microsemi as this will hang the board. Hard reset will be required.
+
+2. If Xfce4 desktop disk image is used with HiFive Unleashed Expansion Board and GPU then rebooting is required after the 1st boot.
+
+3. Newer OE/Yocto buildtools could cause build issues for `nspr-native` package. Use `-r yocto-3.2_M2 -t 20200729` as described in README file if you are using OE/Yocto buildtools. See Yocto bug [#14112](https://bugzilla.yoctoproject.org/show_bug.cgi?id=14112)
+
+4. We have found an issue with SanDisk "A2" microSD cards and thus do not recommend them.