Add known issues category and two related articles (#19)

_articles/known-issues/auto-fill-firefox-private-mode.md

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+---
+layout: article
+title: Can't auto-fill in Firefox Private Browsing
+categories: [Known Issues]
+featured: false
+popular: false
+tags: [firefox, extension, private mode, private browsing, auto fill]
+---
+
+## Issue
+The bitwarden extension does not load when I open it in Firefox Private Browsing so I am unable to auto-fill forms.
+
+## Workaround
+If the bitwarden extension is locked (little red lock icon), unlock it in a non-private Firefox window before proceeding.
+1. Navigate to the website's login page in Firefox Private Browsing
+2. Right click the page
+    - A context menu will appear
+3. Select **bitwarden > Auto-fill > the website**

_articles/known-issues/extension-wont-load-in-private-mode.md

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+---
+layout: article
+title: Extension won't load in Firefox Private Browsing
+categories: [Known Issues]
+featured: false
+popular: false
+tags: [firefox, extension, private mode, private browsing]
+---
+
+## Issue
+The bitwarden extension does not load/appears blank when I open it in Firefox Private Browsing.
+
+## Details
+This is a known issue with Firefox that Mozilla is unwilling to fix.
+
+>It is due to the popup being unable to communicate with the background page during private mode. Mozilla claims that inter-window communication should not be allowed in private mode.
+
+## Workaround
+If you are looking to auto-fill usernames and passwords while in Firefox Private Browsing, please visit [https://help.bitwarden.com/article/auto-fill-firefox-private-mode](/article/auto-fill-firefox-private-mode/#workaround).
+
+## References
+1. bitwarden discussion - <https://github.com/bitwarden/browser/issues/136>
+2. FireFox Bugzilla - <https://bugzilla.mozilla.org/show_bug.cgi?id=1329304>

_categories/known-issues.md

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+---
+layout: category
+title: Known Issues
+featured: true
+---