docs: join the team (#2954)

docs/JOIN_TEAM.md

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+# Join SimpleX Chat team
+
+SimpleX Chat Ltd is a seed stage startup with a lot of user growth in 2022-2023, and a lot of exciting technical and product problems to solve to grow faster.
+
+We currently have 4 full-time people in the team - all engineers, including the founder.
+
+We want to add up to 3 people to the team. 
+
+
+**You**:
+
+- **Passionate about joining SimpleX Chat team**:
+  - already use SimpleX Chat to communicate with friends/family or participate in public SimpleX Chat groups.
+  - passionate about privacy, security and communications.
+  - are willing to make a contribution to the project in your free time before we hire you, as an extended test.
+
+- **Exceptionally pragmatic, very fast and customer-focussed**:
+  - care about the customers (aka users) and about the product we build much more than about the code quality, technology stack, etc.
+  - believe that the simplest solution is the best.
+  - 2-3x faster than the most competent people you worked with.
+  - focus on solving only today's problems and resist engineering for the future (aka over-engineering) – see [The Duct Tape Programmer](https://www.joelonsoftware.com/2009/09/23/the-duct-tape-programmer/) and [Why I Hate Frameworks](https://medium.com/@johnfliu/why-i-hate-frameworks-6af8cbadba42).
+  - do not suffer from "not invented here" syndrome, at the same time interested to design and implement protocols and systems from the ground up when appropriate.
+
+- **Love software engineering**:
+  - have 5y+ of software engineering experience in complex projects, 
+  - great understanding of the common principles:
+    - data structures, bits and byte manipulation
+    - text encoding and manipulation
+    - software design and algorithms
+    - concurrency
+    - networking
+
+- **Want to join a very early stage startup**:
+  - high pace and intensity, longer hours
+  - a substantial part of the compensation in stock options
+  - too much [autonomy](https://twitter.com/KentBeck/status/851459129830850561) hurts – we believe in transparency
+
+
+## Who we are looking for
+
+### Systems Haskell engineer
+
+You are a servers/network/Haskell expert:
+- network libraries.
+- exception handling, concurrency, STM.
+- type systems - we use ad hoc dependent types a lot.
+- strictness.
+- has some expertise in network protocols, cryptography and general information security principles and approaches.
+- interested to build the next generation of messaging network.
+
+You will be focussed mostly on our servers code, and will also contribute to the core client code written in Haskell. 
+
+
+### Product engineer (iOS)
+
+You are a product UX expert who designs great user experiences directly in iOS code:
+- iOS and Mac platforms, including:
+  - SwiftUI and UIKit.
+  - extensions, including notification service extension and sharing extension
+  - low level inter-process communication primitives for concurrency
+- interested about creating the next generation of UX for a communication/social network.
+
+Knowledge of Android and Kotlin Multiplatform would be a bonus - we use Kotlin Jetpack Compose for our Android and desktop apps.
+
+
+## How to join the team
+
+1. [Install the app](../README.md#install-the-app), try using it with the friends and [join some user groups](https://github.com/simplex-chat/simplex-chat#join-user-groups) – you will discover a lot of things that need improvements.
+
+2. Also look through [GitHub issues](https://github.com/simplex-chat/simplex-chat/issues) submitted by the users to see what would you want to contribute as a test.
+
+3. [Connect to us](https://simplex.chat/contact#/?v=1&smp=smp%3A%2F%2Fu2dS9sG8nMNURyZwqASV4yROM28Er0luVTx5X1CsMrU%3D%40smp4.simplex.im%2FKBCmxJ3-lEjpWLPPkI6OWPk-YJneU5uY%23%2F%3Fv%3D1%26dh%3DMCowBQYDK2VuAyEAtixHJWDXvYWcoe-77vIfjvI6XWEuzUsapMS9nVHP_Go%253D%26srv%3Do5vmywmrnaxalvz6wi3zicyftgio6psuvyniis6gco6bp6ekl4cqj4id.onion) via SimpleX Chat to chat about what you want to contribute and about joining the team.