Change "Publish UTBot" workflow trigger, edit README.md

Author: Alexey Pleshakov

.github/workflows/publish-utbot.yml

@@ -2,7 +2,7 @@ name: Publish UTBot as an archive
 
 on:
   push:
-#    branches: [main]
+    branches: [main]
 
 jobs:
   publish:

README.md

@@ -1,2 +1,29 @@
-# UTBotCpp
-Tool that generates unit test by C/C++ source code, trying to reach all branches and maximize code coverage
+# What is UTBotCpp?
+UTBotCpp generates test cases by code, trying to cover maximum statements and execution paths. 
+We treat source code as source of truth assuming that behavior is correct and corresponds to initial user demand.
+Generated tests are placed in so-called regression suite.
+Thus, we fixate current behavior by generated test cases.
+Using UTBotCpp developers obtain full control of their code.
+No future change can break the code without being noticed once it's covered with tests generated by UTBot.
+This way, modifications made by developers to an existing code are much safer.
+Hence, with the help of generated unit tests, UTBot provides dramatic code quality improvement.
+
+## How to install and use UTBot
+
+For now, you can only use UTBot under Ubuntu.
+UTBot has been tested under Ubuntu 14, 16, and 18.
+Navigate to the **Releases** GitHub page and download any version of UTBot.
+UTBot is distrbuted as an archive that contains
+1. A pack `utbot_distr.tar.gz` that contains UTBot binary and its dependencies;
+2. UTBot plugin for Visual Studio code — `utbot_plugin.vsix`;
+3. A version `version.txt`;
+4. A run script `unpack_and_run_utbot.sh`.
+
+To launch UTBot, `unzip` the archive and run the 
+`chmod +x unpack_and_run_utbot.sh && ./unpack_and_run_utbot.sh` command (we recommend doing it in a fresh directory to make UTBot removing easier). To remove UTBot, simply delete this directory.
+
+To install UTBot VSCode plugin, use VSCode *Install from VSIX* command.
+
+## How to contribute to UTBot
+
+See **DEVNOTE.md**.