Add iamb to list of Matrix clients

gatsby/content/projects/clients/iamb.mdx

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+---
+layout: projectimage
+title: iamb
+slug: iamb
+categories:
+    - client
+thumbnail: /docs/projects/images/iamb-small.png
+description: iamb is a terminal-based Matrix client with Vim keybindings written in Rust
+author: ulyssa
+maturity: Beta
+language: Rust
+license: Apache-2.0
+repo: https://github.com/ulyssa/iamb
+home: https://iamb.chat
+screenshot: /docs/projects/images/iamb.png
+room: "#iamb:0x.badd.cafe"
+SDK: matrix-rust-sdk
+featured: true
+platforms:
+    - Linux
+    - Mac
+    - Windows
+client_type: terminal
+features:
+    Room directory: no
+    Room tag showing: yes
+    Room tag editing: yes
+    Search joined rooms: no
+    Room user list: yes
+    Display Room Description: yes
+    Edit Room Description: yes
+    Highlights: no
+    Pushrules: no
+    Send read markers: yes
+    Display read markers: yes
+    Sending Invites: yes
+    Accepting Invites: yes
+    Typing Notification: yes
+    E2E: yes
+    Replies: yes
+    Attachment uploading: yes
+    Attachment downloading: yes
+    Send stickers: no
+    Send formatted messages (markdown): yes
+    Rich Text Editor for formatted messages: no
+    Display formatted messages: yes
+    Redacting: yes
+    Multiple Matrix Accounts: yes
+    New user registration: no
+    voip: no
+    Reactions: yes
+    Message editing: yes
+    Room upgrades: no
+    Localisations: 1
+    SSO Support: no
+---
+
+# iamb
+
+iamb is a terminal-based Matrix client that uses Vim keybindings.
+
+It is written in Rust using [matrix-rust-sdk] and [modalkit].
+
+[matrix-rust-sdk]: https://matrix.org/docs/projects/sdk/matrix-rust-sdk
+[modalkit]: https://github.com/ulyssa/modalkit